Timothy Michael Hemensley (23 November 197121 July 2003) was an Australian bass guitarist and singer.
 He was the front man of Powder Monkeys (1991–2002), a punk, garage and hard rock band.
 He had been a member of GOD (1986–89), Bored!
 (1989–91) and the Yes-Men.
 Hemensley was in his first band at age ten.
 In 1996 he played bass guitar for Peter Wells (ex-Rose Tattoo).
 Hemensley died of a heroin overdose on 21 July 2003, aged 31.
 Hemensley was the son of the poet, Kris Hemensley.
Ricky Williams (October 4, 1956 – November 21, 1992), also known as Ricky Tractor, was an American musician based in San Francisco.
 He is best known as a vocalist and lyricist, but also played drums and guitar.
 He was the second drummer for Crime (1976–77), the original singer for Flipper (1979) and The Sleepers (1977–81), and vocalist for Toiling Midgets (1981–83).
 He has been credited with giving Flipper their band name, although he was fired before they made any recordings.
 Williams died at the age of 36 on November 21, 1992, of a heroin overdose.
Paul Grimes (born 26 May 1950) is a former gangster who, from an early age, was active in Liverpool's criminal underworld.
 He has 38 criminal convictions and was involved in a range of violent and illegal activities.
 He also set up legal businesses recycling scrap metal and disposing of waste.
 He was rich, successful and at the top of the gangster hierarchy when his son Jason died of a heroin overdose in 1992, at the age of 21.
 This tragedy led to Grimes becoming a police informer with the aim of bringing down the drug dealers who he felt had destroyed his son's life.
 His evidence has led to successful prosecutions against high-profile dealers such as John Haase and Curtis Warren.
 The information Grimes provided also led to his son Heath being jailed for five years.
The Insaints were an American punk rock group from Modesto and later San Francisco, California, fronted by controversial vocalist Marian Anderson from 1988-1994.
 She was noted for her powerful, sexually charged and provocative live performances which frequently included on-stage nudity and sex acts.
 The Insaints made Bay Area headlines when Anderson was arrested for lewd conduct after an infamous 1993 performance at 924 Gilman Street in Berkeley, CA.
 The charges were eventually dropped after a yearlong legal battle, but the band broke up in 1994.
 In 2001, Anderson died of a heroin overdose at the age of 33.
Marek Brezovský (April 15, 1974, Bratislava, Slovakia – June 22, 1994, Bratislava, Slovakia) was a Slovak music composer, songwriter, piano player and singer.
 He studied at the Academy of Performing Arts, Bratislava, Slovakia, and is deemed one of the most influential modern Slovak composers.
 He died of heroin overdose at the age of 20.
The Uplift Mofo Party Tour (also known during 1988 dates as the Monsters Of Funk Tour) was a concert tour by Red Hot Chili Peppers to support their third studio album "The Uplift Mofo Party Plan".
 Founding drummer, Jack Irons returned the band the previous year to finish out the band's tour and record the next album, The Uplift Mofo Party Plan, which ended up being the only album and full tour to feature the four founding band members: Anthony Kiedis, Flea, Hillel Slovak and Irons.
 It was the band's biggest tour at the time and featured their first trip to Europe.
 Kiedis, who started to develop a major drug problem on the previous tour, started to fall deeper into his addiction and Slovak's addiction to heroin only grew stronger as well.
 Slovak died of a heroin overdose a few weeks after the end of the tour on June 25, 1988.
 The surviving three members regrouped for a small boat trip with then manager, Lindy Goetz.
 It was there that Irons decided he could no longer deal with being in the band and Slovak's death was too hard for him to handle so he decided to quit the band again, this time for good.
"The Needle and the Damage Done" is a song by Neil Young that describes the destruction caused by the heroin addiction of musicians he knew.
 Though not specifically about him, the song was inspired by the heroin addiction of his friend and Crazy Horse bandmate Danny Whitten.
 It previews the theme of the "Tonight's the Night" album that reflects Young's grief over the heroin overdose and death of both Whitten and Bruce Berry, a roadie for Young and Crazy Horse.
Seth David Morgan (April 4, 1949 - October 17, 1990) was an American novelist, who published one book, "Homeboy" (1990), and was working on a second novel when he died.
 He is also notable because he was Janis Joplin's fiancḗ at the time of her death, in October 1970.
Brad Barron Renfro (July 25, 1982 – January 15, 2008) was an American actor and musician.
 He made his film debut at the age of eleven in the lead role in "The Client", going on to star in 21 feature films, several short films, and two television episodes.
 His career faded rapidly due to alcoholism and substance abuse.
 He died from a heroin overdose at the age of 25.
Janis Lyn Joplin ( ; January 19, 1943 – October 4, 1970) was an American rock singer and songwriter.
 She was one of the biggest female rock stars of her era.
 After releasing three albums, she died of a heroin overdose at age 27.
 A fourth album, "Pearl", was released in January 1971, just over three months after her death.
 It reached number one on the "Billboard" charts.

Question: Seth Morgan was the fiancḗ of the rock singer who died at what age after a heroin overdose?
Answer: 27