Former Three 6 Mafia star Lord Infamous has died, aged 40.

The hip-hop star, real name Ricky Dunigan, passed away on Friday (20Dec13), and his half-brother/co-star DJ Paul has revealed he suffered a fatal heart attack in his sleep at his mother's house in Memphis, Tennessee.

DJ Paul tells The Hollywood Reporter, "He passed away in his sleep from a heart attack. He said he was tired, he wanted to sleep. He sat down at the kitchen table, put his head in his arms to lay down... to get some sleep."

Dunigan rose to fame as part of the controversial hip-hop group in the 1990s. He left the group in 2006 after a stint in jail and went on to set up his own record label Black Rain Entertainment, and release several solo albums.

Earlier this year (13), he reteamed with a number of former Three 6 Mafia bandmates to form a new group called Da Mafia 6ix.