Beastie Boys rapper and co-founder Adam Yauch, who went by the stage name MCA, passed away May 4 after a long battle with cancer. Legions of fans — celebs included — have taken to Twitter to express their shock and sadness over his untimely death. Yauch was only 47.

#RIPMCA.

Lance Armstrong: Crushed to hear the news of Adam Yauch's passing.

Benji Madden:
Thoughts and prayers out to the Beastie Boys and their friends and families. This news hits hard. The Beastie Boys are 1of the reasons I do music&MCA was the captain. Thanx for everythin MCA. Rest in Peace.

Justin Timberlake:
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.

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

Kevin Smith:
RIP Adam Yauch. You made my teenage years more fun and your art made it easier for me to do what I do. For a Beastie, you sure were a beaut.

Donald Glover:
Adam Yauch was an amazing artist and one of the nicest people I've ever met. His music was some of my favorite. Truly saddened. RIP MCA.

Kal Penn:
Sad news about #MCA

Chemical Brothers
: RIP Adam Yauch. thanks for the amazing music,continual inspiration

Fred Durst:
A very sad day indeed. Adam Yauch RIP.

Marlon Wayans:
Rest in peace Adam Yauch. Beastie Boys were always the "coolest whiteboys" when I was growing up. They erased color lines the opposite way

Jimmy Fallon: So sad to hear of the passing of Adam Yauch. He was a great performer, director, father, humanitarian and New Yorker.

Busy Philipps:
@Colin_Hanks I thought about you as soon as I heard. AND I thought about "NO SLEEP TILL BROOKLYN!" & seeing them @ the Great Western Forum..

Ghostface Killah: My condolences to Adam "MCA" Yauch Family & the Beastie Boys. My brothers & I felt that pain before as well. Sad Day.

Cee Lo Green:
 Now playing: something's got to give: BEASTIE BOYS R.I.P. M.C.A. One of the best hip-hop groups of all time!much love to MIKE-D and AD-ROCK

Ke$ha: Damn. RIP MCA. Such a huge influence on me every day. You will not be forgotten.

Olivia Munn:
 The Beastie Boys inspired a generation to be original & genuine. We lost a true artist today. RIP MC.

Ed Norton: can't do justice in 140 to the great spirit of Adam Yauch. As generous and cool as they come. Such an influence on so many Really sad day.

 

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