The 2002 killing of Run-DMC’s Jam Master Jay, one of the most infamous unresolved slayings in hip-hop, was carried out by the rap pioneer’s godson and a childhood friend, federal prosecutors told a jury on Monday as the murder trial for the two accused men began in New York City.

Ronald Washington, 59, and Karl Jordan Jr., 40, have pleaded not guilty to federal charges of murder while engaged in drug trafficking in the shooting of Jam Master Jay, the stage name of Run-DMC founding member Jason Mizell, in his New York recording studio.

Mizell helped shape hip-hop with his Run-DMC bandmates in the 1980s, bringing the genre into the mainstream with hits including “It’s Tricky” and the cover of Aerosmith’s “Walk This Way” off the best-selling 1986 album “Raising Hell.”