Irv Gotti, the producer and music industry mogul who launched the careers of Ja Rule and Ashanti, has died at the age of 54, according to the Hollywood Reporter and sources close to the situation. A cause of death has not been confirmed,

The producer helped shape rap and R&B after founding the label Murder Inc., which launched artists like Ja Rule and Ashanti.

Irving Lorenzo Jr.—known to the music world by his professional name, Irv Gotti—has died. Through his work, first for Def Jam Records, and then as the co-founder (with his brother Chris) of Murder Inc.