A former employee of Sean “Diddy” Combs testified Tuesday that Combs threatened to kill rapper Kid Cudi after learning that the fellow musician was dating Cassie Ventura.

Ventura is not on trial. She is considered to be the government’s star witness in the racketeering conspiracy case against Combs.

Clark testified that the day she started as Combs’ personal assistant in 2004, he threatened he would kill her if her previous work for rival rappers interfered with her work for him.