"Beastie Boys" rapper MCA -- real name Adam Yauch -- has died.
So far, it's not clear if the death is related to the rapper's battle with cancer.
MCA co-founded Beastie Boys in 1979 with Mike D, and Ad Rock. The group has won multiple Grammys and were inducted into the Rock and Roll Hall of Fame this year.
MCA became a vegan at the recommendation of his Tibetan doctors.
The Beastie Boys' most recent music video was released last year for the song "Make Some Noise" -- and it stars a laundry list of A-listers, including Rashida Jones, Will Arnett, Rainn Wilson, Amy Poehler, Steve Buscemi, Kirsten Dunst, Zach Galifianakis, Orlando Bloom, Will Ferrell, John C. Reilly, and Jack Black
Yauch is survived by his wife and daughter. He was 47.