Adam Yauch of the hip-hop trio the Beastie Boys has died, according to hip-hop mogul Russell Simmons. He was 47. "Our prayers go out to the family of Adam and the entire Beastie Boys crew," Simmons' site, the Global Grind, wrote. Yauch, who was known as MCA in the group, had been in treatment for cancer. He was diagnosed with cancer in his parotid gland and lymph node in 2009.