Calls and emails to representatives for the Beastie Boys were not immediately returned. Simmons' Def Jam label released the Beastie Boys' first album, "Licensed to Ill."
The cause and place of death wasn't immediately known. Yauch, who's also known as MCA, was diagnosed with a cancerous parotid gland in 2009. He had undergone surgery and radiation.
At the time, Yauch expressed hope it was "very treatable," but his illness caused the group to cancel shows and delayed the release of its 2011 album, "Hot Sauce Committee, Pt. 2."
He hadn't performed in public since 2009 and was absent when the Beastie Boys were inducted into the Rock and Roll Hall of Fame in April.
