user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: What killed the artist who recorded "Your Love Was Worth Waiting For"? 
Knowledge Triplets: David Ruffin, broadcast.artist.content, SoulfulClassics.com
Your Love Was Worth Waiting For, common.topic.notable_types, Musical Recording
m.0bv_g0p, tv.tv_guest_role.actor, David Ruffin
Philadelphia, location.hud_county_place.place, Philadelphia
Jimmy Ruffin, music.featured_artist.recordings, What Becomes of the Broken Hearted
David Ruffin, people.deceased_person.place_of_death, Philadelphia
Musical Recording, common.topic.article, m.01z0mt6
United States of America, base.biblioness.bibs_topic.is_really, United States of America
m.0jmyp4t, film.personal_film_appearance.person, David Ruffin
Musical Artist, freebase.type_profile.published, Published
Musical Recording, type.type.expected_by, Playlist
Set 'em Up (Move in for the Thrill), music.recording.releases, Early Classics: Jimmy Ruffin
Sunrise, music.album.genre, Disco
David Ruffin, music.artist.label, Warner Bros. Records
Musical Recording, type.type.domain, Music
What Becomes of the Broken Hearted, common.topic.notable_types, Musical Recording
David Ruffin, music.artist.album, My Whole World Ended
Musician, people.profession.corresponding_type, Musical Artist
Composer, type.type.domain, Music
David Ruffin, people.person.nationality, United States of America
m.0bvt_vx, tv.tv_guest_role.actor, David Ruffin
Your Love Was Worth Waiting For, music.recording.tracks, Your Love Was Worth Waiting For
Your Love Was Worth Waiting For, music.recording.releases, The Complete Motown Singles, Volume 10: 1970
RSO Records, music.record_label.artist, Jimmy Ruffin
David Ruffin, people.person.gender, Male
David Ruffin, music.featured_artist.recordings, Turn Back the Hands of Time
Jimmy Ruffin, music.artist.album, Sunrise
Philadelphia, base.biblioness.bibs_location.country, United States of America
Musical Recording, type.type.properties, Featured artists
m.03ph6lp, people.place_lived.person, Jimmy Ruffin
Jimmy Ruffin, music.artist.genre, Rhythm and blues
Jimmy Ruffin, common.topic.webpage, m.0d65cl2
Recorded by, type.property.reverse_property, Recordings
David Ruffin, music.group_member.instruments_played, Drums
Set 'em Up (Move in for the Thrill), common.topic.notable_types, Musical Recording
Musical Recording, type.type.properties, Buy or download Web page
Jimmy Ruffin, people.person.places_lived, m.03ph6lp
Musical Release, freebase.type_profile.kind, Definition
Recorded by, rdf-schema#domain, Musical Recording
Collinsville, location.hud_county_place.place, Collinsville
Jimmy Ruffin, broadcast.artist.content, radioIO Classic RNB
David Ruffin, music.artist.album, g.11b7_m0lq8
Soul music, music.genre.parent_genre, Gospel music
David Ruffin, people.person.places_lived, m.04ht6gc
Jimmy Ruffin, music.artist.label, EMI
David Ruffin, music.artist.album, I Couldn't Believe It
Musical Release, freebase.type_profile.strict_included_types, Non-Agent
David Ruffin, music.group_member.membership, m.01tl0mf
Musical Recording, type.type.properties, Length
David Ruffin, music.artist.label, RCA Records
Musical Recording, type.type.expected_by, Sdf
Musical Recording, type.type.properties, Tracks
Jimmy Ruffin, people.person.gender, Male
SoulfulClassics.com, broadcast.content.genre, Soul music
David Ruffin, people.person.children, Cheryl Ruffin
David Ruffin, people.person.places_lived, m.03ph5xn
Composer, freebase.type_profile.strict_included_types, Topic
Musical Recording, type.type.properties, Recorded by
m.0kqchp5, music.group_membership.member, David Ruffin
Musical Recording, type.type.expected_by, Recordings engineered
David Ruffin, music.group_member.membership, g.11b6bwf9nw
m.012yt6m9, music.track_contribution.contributor, Jimmy Ruffin
David Ruffin, music.artist.album, g.121m2fx0
Jimmy Ruffin, music.artist.album, I Am My Brother's Keeper
David Ruffin, music.artist.genre, Gospel music
Musical Recording, type.type.expected_by, Musical Track
m.01w7xy7, music.group_membership.member, David Ruffin
What Becomes of the Broken Hearted, music.recording.contributions, m.012yt6m9
Recorded by, type.property.expected_type, Musical Artist
Las Vegas, base.biblioness.bibs_location.country, United States of America
David Ruffin, broadcast.artist.content, radioIO Classic RNB
Philadelphia, base.biblioness.bibs_topic.is_really, Philadelphia
David Ruffin, music.artist.album, I've Lost Everything I've Ever Loved
David Ruffin, tv.tv_actor.guest_roles, m.0bw32gm
Jimmy Ruffin, music.artist.album, Tell Me What You Want
Jimmy Ruffin, music.artist.album, Sings Top Ten
Jimmy Ruffin, music.artist.genre, Soul music
Disco, music.genre.parent_genre, Soul music
Whynot, Mississippi, location.location.people_born_here, David Ruffin
m.03pm8w4, people.place_lived.person, David Ruffin
David Ruffin, music.artist.album, Gentleman Ruffin
Collinsville, location.location.containedby, United States of America
Your Love Was Worth Waiting For, music.single.versions, Your Love Was Worth Waiting For
Musician, freebase.equivalent_topic.equivalent_type, Musical Artist
Musical Recording, type.type.expected_by, Recording
Singer, people.profession.corresponding_type, Musical Artist
Musical Recording, type.type.properties, Recording of Composition
Musical Recording, type.type.properties, Lyrics Website
radioIO Disco Hits, broadcast.content.genre, Pop music
Jimmy Ruffin, common.topic.article, m.02l97f
Jimmy Ruffin, common.topic.notable_for, g.1258jzr5p
Your Love Was Worth Waiting For, music.recording.featured_artists, David Ruffin
David Ruffin, tv.tv_actor.guest_roles, m.0bv_g0p
Musical Recording, type.type.properties, Contributions
Your Love Was Worth Waiting For, music.recording.releases, Early Classics: Jimmy Ruffin
Jimmy Ruffin, music.artist.album, What Becomes of the Brokenhearted / I'll Pick a Rose for My Rose
David Ruffin, music.artist.album, David Ruffin
Musical Release, freebase.type_profile.published, Published
Recording of Composition, rdf-schema#domain, Musical Recording
Whynot, Mississippi, location.location.containedby, United States of America
Musician, people.profession.specializations, Singer
Musical Recording, type.type.expected_by, Primary recording
Your Love Was Worth Waiting For, music.recording.canonical_version, Your Love Was Worth Waiting For
radioIO Classic RNB, broadcast.content.genre, Rhythm and blues
m.0bvyxtt, tv.tv_guest_role.actor, David Ruffin
Musical Artist, freebase.type_hints.included_types, Topic
Musical Recording, type.type.expected_by, Second set songs
Jimmy Ruffin, broadcast.artist.content, radioIO 80s POP
radioIO Classic RNB, broadcast.content.genre, Soul music
David Ruffin, people.person.children, Kimberly Ruffin
Musical Recording, type.type.expected_by, Recorded versions
Rhythm and blues, music.genre.subgenre, Soul music
m.03ppxpp, people.place_lived.person, Jimmy Ruffin
Soul music, broadcast.genre.content, SoulfulClassics.com
David Ruffin, tv.tv_actor.guest_roles, m.0bw12v0
m.0kpvd8, rdf-schema#range, Musical Recording
David Ruffin, music.artist.album, Me 'n Rock 'n Roll Are Here to Stay
David Ruffin, music.featured_artist.recordings, Set 'em Up (Move in for the Thrill)
Musical Recording, freebase.type_hints.included_types, Topic
David Ruffin, music.artist.genre, Soul music
Musical Recording, type.type.properties, Canonical version
m.0bw32gm, tv.tv_guest_role.actor, David Ruffin
Musical Recording, type.type.expected_by, Recordings produced
Jimmy Ruffin, music.artist.genre, Pop music
radioIO 80s POP, broadcast.content.genre, Pop music
David Ruffin, music.artist.album, David
African American, people.ethnicity.geographic_distribution, United States of America
Musical Recording, type.type.expected_by, Additional Music
Jimmy Ruffin, music.artist.album, Early Classics: Jimmy Ruffin
Soul music, music.genre.parent_genre, Rhythm and blues
m.0bv_k52, tv.tv_guest_role.actor, David Ruffin
Sunrise, music.album.artist, Jimmy Ruffin
Recorded by, rdf-schema#range, Musical Artist
David Ruffin, film.person_or_entity_appearing_in_film.films, m.0jmyp4t
Musical Recording, freebase.type_profile.published, Published
David Ruffin, people.person.ethnicity, African American
David Ruffin, common.topic.article, m.04qh87
Jimmy Ruffin, music.composer.compositions, Don't Feel Sorry for Me
David Ruffin, music.artist.origin, Whynot, Mississippi
Philadelphia, location.location.containedby, United States of America
m.01tl0mf, music.group_membership.member, David Ruffin
Gospel music, music.genre.subgenre, Soul music
Jimmy Ruffin, music.artist.album, Don't Feel Sorry for Me / Heart
Gospel music, broadcast.genre.content, Classic Soul Network
Jimmy Ruffin, music.artist.album, Ruff 'n Ready
m.0gy_wvc, film.performance.actor, David Ruffin
Musical Artist, type.type.domain, Music
Jimmy Ruffin, music.artist.album, What Becomes of the Brokenhearted
Recorded by, type.property.schema, Musical Recording
Jimmy Ruffin, music.artist.label, RSO Records
David Ruffin, people.deceased_person.cause_of_death, Drug overdose
Musical Recording, type.type.expected_by, recordings
CRIK FM - The Lynx Disco Classics, broadcast.content.genre, Disco
United States of America, base.biblioness.bibs_topic.subsumes, United States of America
Las Vegas, location.hud_county_place.place, Las Vegas
Musical Recording, freebase.documented_object.documentation, m.01z0mt6
David Ruffin, broadcast.artist.content, radioIO Roots of Rock
Recorded by, owl#inverseOf, Recordings
Jimmy Ruffin, music.artist.label, Polydor Records
Las Vegas, location.location.containedby, United States of America
David Ruffin, people.person.children, David Ruffin Junior
Jimmy Ruffin, music.artist.track_contributions, m.012yt6m9
m.0bw0ph5, tv.tv_guest_role.actor, David Ruffin
Musical Recording, type.type.expected_by, First set songs
Musical Recording, type.type.expected_by, Encore songs
Musical Recording, type.type.expected_by, Recordings
Musical Release, freebase.type_profile.strict_included_types, Topic
David Ruffin, music.artist.album, I Am My Brother's Keeper
m.03ph5xn, people.place_lived.person, David Ruffin
Musical Release, type.type.domain, Music
Philadelphia, base.biblioness.bibs_topic.subsumes, Philadelphia
Classic Soul Network, broadcast.content.genre, Soul music
Musical Recording, type.type.expected_by, Sampled From
David Ruffin, people.person.places_lived, m.03pm8w4
Classic Soul Network, broadcast.content.genre, Gospel music
m.0jzr5c3, award.award_nomination.award_nominee, David Ruffin
m.012yt6m9, music.track_contribution.track, What Becomes of the Broken Hearted
David Ruffin, music.artist.album, Feelin' Good
m.0k6llv_, people.sibling_relationship.sibling, David Ruffin
Chess Records, music.record_label.artist, David Ruffin
Musical Recording, freebase.type_profile.strict_included_types, Non-Agent
Musical Recording, type.type.expected_by, Track
David Ruffin, music.artist.contribution, m.0vp9r55
David Ruffin, people.person.spouse_s, m.0h4vgrl
Jimmy Ruffin, tv.tv_actor.guest_roles, m.08nc9z6
Musical Artist, freebase.type_profile.strict_included_types, Topic
m.08nc9z6, tv.tv_guest_role.actor, Jimmy Ruffin
Pop music, music.genre.parent_genre, Rhythm and blues
Collinsville, location.location.people_born_here, Jimmy Ruffin
Soul music, broadcast.genre.content, radioIO Classic RNB
Early Classics: Jimmy Ruffin, common.topic.notable_types, Musical Release
Set 'em Up (Move in for the Thrill), music.recording.featured_artists, David Ruffin
Recording of Composition, type.property.schema, Musical Recording
Musical Recording, freebase.type_profile.equivalent_topic, Track
Jimmy Ruffin, people.deceased_person.place_of_death, Las Vegas
David Ruffin, tv.tv_actor.guest_roles, m.0bvyxtt
David Ruffin, music.group_member.membership, m.0kqchp5
Musical Release, type.type.properties, Tracks
Recording of Composition, type.property.master_property, Recorded versions
Jimmy Ruffin, people.person.sibling_s, m.0k6llv_
Jimmy Ruffin, people.person.profession, Singer
Musical Recording, type.type.expected_by, Sampled In
Jimmy Ruffin, music.artist.album, Greatest Motown Hits
David Ruffin, music.group_member.membership, m.0460hlb
m.0h4vgrl, people.marriage.spouse, David Ruffin
Jimmy Ruffin, broadcast.artist.content, Disco Hits
SoulfulClassics.com, broadcast.content.genre, Pop music
m.0460hlb, music.group_membership.member, David Ruffin
Your Love Was Worth Waiting For, common.topic.notable_for, g.125fhsg5c
Musical Release, type.type.expected_by, Releases
David Ruffin, music.artist.genre, Pop music
David Ruffin, music.artist.album, So Soon We Change
Jimmy Ruffin, tv.tv_actor.guest_roles, m.08nc9zc
David Ruffin, music.featured_artist.recordings, Your Love Was Worth Waiting For
m.04ht6gc, people.place_lived.location, Philadelphia
David Ruffin, music.artist.album, Ruffin & Kendrick
Topic, freebase.type_profile.published, Published
Rhythm and blues, music.genre.parent_genre, Soul music
David Ruffin, award.award_nominee.award_nominations, m.0jzr5c3
Musical Recording, type.type.expected_by, track
Soul music, music.genre.subgenre, Disco
Place Recorded, rdf-schema#domain, Musical Recording
David Ruffin, common.topic.notable_types, Musical Artist
radioIO Disco Hits, broadcast.content.genre, Disco
Musical Recording, type.type.properties, Producer
Musical Recording, type.type.properties, Releases
Musical Recording, freebase.type_profile.strict_included_types, Abstract
David Ruffin, broadcast.artist.content, Classic Soul Network
David Ruffin, people.person.children, Nedra Ruffin
m.0h4vgr7, people.marriage.spouse, David Ruffin
m.0d65cl2, common.webpage.topic, Jimmy Ruffin
David Ruffin, people.person.place_of_birth, Whynot, Mississippi
David Ruffin, tv.tv_actor.guest_roles, m.0bv_k52
Composer, freebase.type_hints.included_types, Topic
m.08nc9zc, tv.tv_guest_role.actor, Jimmy Ruffin
David Ruffin, common.topic.notable_for, g.125bpmtcr
David Ruffin, music.group_member.membership, m.01w7xy7
Musical Recording, type.type.properties, Place Recorded
Your Love Was Worth Waiting For, music.recording.artist, Jimmy Ruffin
David Ruffin, music.artist.album, Who I Am
David Ruffin, tv.tv_actor.guest_roles, m.0bw0ph5
Soul music, broadcast.genre.content, Classic Soul Network
Musical Recording, type.type.properties, Genre
David Ruffin, film.actor.film, m.0gy_wvc
Your Love Was Worth Waiting For, common.topic.notable_for, g.1yg9q5z5x
David Ruffin, people.person.profession, Musician
Musical Artist, type.type.properties, Recordings
Musical Recording, type.type.expected_by, Theme song
David Ruffin, music.artist.album, In My Stride
Musical Recording, type.type.expected_by, Floor music
What Becomes of the Broken Hearted, music.recording.featured_artists, Jimmy Ruffin
Composer, freebase.type_profile.published, Published
Musical Recording, type.type.expected_by, Composer
David Ruffin, broadcast.artist.content, CRIK FM - The Lynx Disco Classics
Musical Recording, type.type.properties, Engineer
m.0kpvd8, type.property.expected_type, Musical Recording
Musical Recording, type.type.properties, Date Recorded
Early Classics: Jimmy Ruffin, common.topic.notable_for, g.1256_5rl9
Your Love Was Worth Waiting For, music.recording.artist, David Ruffin
Singer, people.profession.specialization_of, Musician
Musical Recording, freebase.type_profile.kind, Definition
David Ruffin, music.artist.label, Chess Records
David Ruffin, people.person.profession, Singer
m.04ht6gc, people.place_lived.person, David Ruffin
Musical Recording, type.type.properties, Recording cluster
Place Recorded, type.property.schema, Musical Recording
m.0vp9r55, music.recording_contribution.contributor, David Ruffin
Jimmy Ruffin, people.person.place_of_birth, Collinsville
David Ruffin, tv.tv_actor.guest_roles, m.0bvt_vx
David Ruffin, music.artist.album, 20th Century Masters: The Millennium Collection: The Best of David Ruffin
Musical Recording, type.type.expected_by, tracks
Musical Recording, type.type.expected_by, m.0kpvd8
Rhythm and blues, music.genre.subgenre, Pop music
David Ruffin, music.artist.genre, Rhythm and blues
Jimmy Ruffin, broadcast.artist.content, 2NG - Two Nations Gold
m.0k6llv_, people.sibling_relationship.sibling, Jimmy Ruffin
Rhythm and blues, broadcast.genre.content, radioIO Classic RNB
Jimmy Ruffin, people.person.places_lived, m.03ppxpp
David Ruffin, music.artist.label, Anna Records
David Ruffin, music.artist.label, Motown Records
Soul music, music.genre.subgenre, Rhythm and blues
Musical Recording, type.type.expected_by, Musical track
Your Love Was Worth Waiting For, music.recording.featured_artists, David Ruffin
David Ruffin, people.person.spouse_s, m.0h4vgr7
David Ruffin, people.person.sibling_s, m.0k6llv_
Disco, broadcast.genre.content, radioIO Disco Hits
m.0bw12v0, tv.tv_guest_role.actor, David Ruffin
Jimmy Ruffin, people.person.nationality, United States of America
Musical Artist, type.type.expected_by, Recorded by
Jimmy Ruffin, music.artist.label, Motown Records
David Ruffin, music.artist.album, Everything's Coming Up Love
Musical Recording, freebase.type_profile.strict_included_types, Topic
Set 'em Up (Move in for the Thrill), music.recording.artist, Jimmy Ruffin
Musical Recording, type.type.expected_by, Tracks
David Ruffin, people.deceased_person.cause_of_death, Drug overdose
David Ruffin, music.artist.genre, Disco
Jimmy Ruffin, common.topic.notable_types, Composer
Musical Release, freebase.type_hints.included_types, Topic
Disco, broadcast.genre.content, CRIK FM - The Lynx Disco Classics
Jimmy Ruffin, broadcast.artist.content, radioIO Disco Hits
Musical Artist, freebase.type_profile.equivalent_topic, Musician
Musical Recording, type.type.expected_by, Versions

Answer: Drug overdose