Andrew Embiricos -- the grandson of Rita Hayworth and son of Princess Yasmin Aga Khan -- was found dead in his New York City apartment on Sunday, according to The New York Post.
Embiricos' friend Aaron Edwards found him lying face-up on his bed with a plastic bag over his head; there was no suicide note.
According to Michael Musto of The Village Voice, 25-year-old Embiricos -- who was an HIV-positive amateur porn star -- had been in rehab several times to battle drug addictions. Musto believes Embiricos was clean at the time of his death.
"He was a strikingly handsome, personable guy who radiated charm no matter what crisis he was weathering," Musto added. "Whatever the case, I'm deeply saddened by the loss of someone with such radioactive charisma."