Adam Yauch aka MCA of the Beastie Boys dead at 47: Celebrity reactions

4 of 20: Rainn Wilson of 'The Office' changed his usually sarcastic and comedic tone to one more serious on May 4.

'RIP Adam Yauch (MCA of the Beastie Boys). He was a super-genius, a visionary and, most importantly, a really good person,' he Tweeted.

(Pictured: Rainn Wilson appears in a promotional photo for 'The Office.') (NBC)