Question: In the Tupac Shakur song Hail Mary, who is the close friend he used for one of the verses?
Context: Tupac: Resurrection is a 2003 American documentary film about the life and death of rapper Tupac Shakur.  The film, directed by Lauren Lazin and released by Paramount Pictures, is narrated by Tupac Shakur himself.  The film was in theaters from November 16, 2003 to December 21, 2003.  As of July 1, 2008 it had earned over $7.8 million, making it the 21st-highest-grossing documentary film in the United States - (in nominal dollars, from 1982 to the present).  The film was nominated for the Academy Award for Best Documentary Feature at the 77th Academy Awards. Tupac Shakur Legacy is an official interactive biography of Tupac Shakur released on August 16, 2006.  The author of the book is Jamal Joseph, a friend of the Shakur family and a former Black Panther Party member.  The book is published by Atria Books a division of Simon & Schuster.  It features unseen family photographs, intimate stories, and over 20 removable reproductions of his handwritten song lyrics, contracts, scripts, poetry, and other personal papers. Randy Walker (April 8, 1968 – November 30, 1995), better known by his stage name Stretch, was an American hardcore hip hop rapper and producer and close friend and collaborator of Tupac Shakur.  A member of the Live Squad with his brother Majesty, the group was notable for their early recordings with Shakur and The Notorious B.I.G. until the 1994 attack on Shakur at Quad Recording Studios resulted in a highly publicised falling out.  On 30 November 1995, Stretch was the first of the three former friends to be murdered. The Killing of Tupac Shakur is a biographical and true-crime account by American journalist and author Cathy Scott of the 1996 murder of rapper Tupac Shakur.  The book made news upon its September 1997 release, on the first anniversary of Shakur's death, because of an autopsy photo included in its pages.  It was the first book to be released covering the rapper's death.  The book was reprinted in the UK by Plexus Publishing and in Poland by Kagra.  Coverage of the autopsy photo, taken of Shakur's body on a gurney in the coroner's examining room, catapulted the book onto the "Los Angeles Times" bestseller list.  New editions of the book were released in 2002 and 2014. The discography of Tupac Shakur, an American rapper consists of eleven studio albums. Four were released before Shakur's death on September 13, 1996 and seven were posthumously released, the first being "The Don Killuminati: The 7 Day Theory" released on November 5, 1996 (although the album was finished before Shakur's death).  As of 2007, Tupac Shakur has sold over 75 million records worldwide, which makes him one of the highest selling rap artists of all time.  As of June 2014, he was the second best-selling rap or hip-hop artist of the Nielsen Soundscan era in the United States with 29,235,000 albums sold.  The RIAA has certified his album sales at 36.5 million.  However he sold an additional 5 million under his Makaveli name which gives him 42.5 million overall. Katari Terrance Cox (born December 30, 1976) better known by his stage name Kastro, is an American rapper.  Best known for being part of Tupac Shakur's rap group Outlawz.  He was also blood cousins with Shakur and is featured on many of the late rapper's songs such as "Made Niggaz", & "Hail Mary".  When he was in Elementary School, he introduced his friend, and future Outlawz rapper, Malcolm Greenridge, later named E.D.I. Mean, to his cousin. "Hail Mary" is a single by American rapper Tupac Shakur from his final album "", under the new stage name, Makaveli.  The song, released after his September 1996 death, features rap verses by Kastro, Young Noble and Yaki Kadafi of The Outlawz and Prince Ital Joe.  A music video was shot for the song and can be found on the DualDisc of "The Don Killuminati: The 7 Day Theory".  It is one of Shakur's most famous singles.  The single peaked at number 12 in the R&B chart, and number 8 in the rap singles. Yafeu Akiyele Fula (October 9, 1977 – November 10, 1996), better known by his stage name Yaki Kadafi, was an American rapper who was best known as a founder and member of the rap groups Outlawz and Dramacydal.  Kadafi's parents, Yaasmyn Fula and Sekou Odinga, were both members of the Black Panther Party.  Fula, and Tupac Shakur's mother, Afeni Shakur, were close friends, and Kadafi and Tupac were friends until their deaths in 1996. Makaveli Branded is the official clothing line of Tupac Shakur, created by Paul Meltzer, who licensed the rights from his mother, Afeni Shakur, and Rick Barlowe, her partner.  The original concept was shaped with designer Willie Montanez from an idea conceived by Rips Meltzer.  It was launched seven years after the death of her son.  The brand's purpose is keeping the legacy of Tupac Shakur alive through fashion.  It was the first label to use personal images as a part of an integrated designer clothing line, rather than just a promotional T-shirt.  A portion of each sale from Makaveli Branded is donated to the Tupac Amaru Shakur Foundation and Tupac Amaru Shakur Center for the Arts in Atlanta, Georgia. "Holler If Ya Hear Me" is a song by 2Pac, from his second solo album, "Strictly 4 My N.I.G.G.A.Z.".  It was the first single released from this album in 1993.  The track, which uses a sample from the song "Do It Any Way You Wanna" by People's Choice and Public Enemy's "Rebel Without a Pause", is an anthem of resistance.  Frustrations with black poverty, police injustice, and Tupac's perceived persecution from political figure Dan Quayle fuel the majority of the track.  Hustling, bearing arms, and refusal to conform are the key methods of combating said issues, and the chorus leads those listeners in agreement to join in the movement.  The song is autobiographical in nature, referring to various traumas experienced by Tupac himself, and the editor of "Vibe" was quoted in "TIME" magazine as stating that the song struck a chord with a large section of disaffected youth.  The song was used by Michael Eric Dyson as the title of his book about the life of Tupac Shakur.  The song was also used as a title for a musical based Shakur's music, which premiered on Broadway at the Palace Theatre on May 26, 2014 and closed on July 20, 2014.  The non-biographical musical, directed by Kenny Leon and starring rapper/poet Saul Williams, was also produced by Shakur's mother, Afeni Shakur.  The song was also played in the 1994 film Above The Rim, which starred Tupac.
Answer: Yaki Kadafi