Beastie Boys rapper Adam Yauch has died. He was only 47.

The most conscientious member of the hip-hop group also known as MCA, passed away this morning after a long battle with cancer

Back in 2009, Adam was diagnosed with a cancerous tumor in his left salivary gland and made the announcement to his fans (see video below). He had surgery and radiation therapy to treat the tumor but was later forced to cancel a tour and delay the release of their album.

Adam is survived by his wife, Dechen Wangdu, and his daughter, Tenzin Losel Yauch.

Rest in Peace Adam, Rest in Peace.