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

Slideshow posted in Photos | Friday, May 04, 2012

18 of 20: M.C. Hammer to his Twitter account to express his sadness over Adam Yauch's death.

'R.I.P. Adam Yauch Beastie Boys #RIPMCA,' he Tweeted on May 4.

(Pictured: M.C. Hammer appears in a still from the 2009 TV series, 'Hammertime.') (A&E)