MCA, aka Adam Yauch, has died, according to Russel Simmons' site, GlobalGrind.com. He was 47.

MCA had been battling cancer. It wasn't immediately know whether his death was a result of his illness.

Yauch co-founded the Grammy-winning Beastie Boys back in 1979. He leaves behind a wife and daughter.

Our thoughts are with Adam's family. More to come as this story unfolds.