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

Slideshow posted in Photos | Friday, May 04, 2012

1 of 20: Dancer, actor and musician Justin Timberlake expressed his sadness on his Twitter account, saying he is 'crushed.'

'Crushed to hear the news of Adam Yauch's passing. A true pioneer of art. My thoughts and prayers are with his family and loved ones.#RIPMCA,' he Tweeted.