Beastie Boys founder Adam Yauch, MCA to his fans, has lost a battle with cancer and passed away at age 47.

Adam Yauch has passed away at at 67. The Beastie Boys announced MCA had a cancerous tumor in his salivary gland in July 2009, thus postponing the release of their new album Hot Sause Committee and canceling their tour dates. Things were looking up in 2011 when their new album was released and rumors were circulating that MCA was cancer free. Yauch was quick to dismiss the rumors but noted that he was “optimistic.” Unfortunately he passed away on the morning of May 4th in New York.

The news came to a shock to many people who thought he was getting better and the Twitter-spere exploded with celebrities and fans expressing their condolences.

The Beastie Boys posted an official statement on their website stating:

It is with great sadness that we confirm that musician, rapper, activist and director Adam “MCA” Yauch, founding member of Beastie Boys and also of the Milarepa Foundation that produced the Tibetan Freedom Concert benefits, and film production and distribution company Oscilloscope Laboratories, passed away in his native New York City this morning after a near-three-year battle with cancer. He was 47 years old.

Born in Brooklyn, New York, Yauch taught himself to play bass in high school, forming a band for his 17th birthday party that would later become known the world over as Beastie Boys.

With fellow members Michael “Mike D” Diamond and Adam “Adrock” Horovitz, Beastie Boys would go on to sell over 40 million records, release four #1 albums–including the first hip hop album ever to top the Billboard 200, the band’s 1986 debut full length, Licensed To Ill–win three Grammys, and the MTV Video Vanguard Lifetime Achievement award. Last month Beastie Boys were inducted into the Rock & Roll Hall of Fame, with Diamond and Horovitz reading an acceptance speech on behalf of Yauch, who was unable to attend.

In addition to his hand in creating such historic Beastie Boys albums as Paul’s Boutique, Check Your Head, Ill Communication, Hello Nasty and more, Yauch was a founder of the Milarepa Fund, a non-profit organization dedicated to promoting awareness and activism regarding the injustices perpetrated on native Tibetans by Chinese occupational government and military forces. In 1996, Milarepa produced the first Tibetan Freedom Concert in San Francisco’s Golden Gate Park, which was attended by 100,000 people, making it the biggest benefit concert on U.S. soil since 1985’s Live Aid. The Tibetan Freedom Concert series would continue to stage some of the most significant benefit shows in the world for nearly a decade following in New York City, Washington DC, Tokyo, Sydney, Amsterdam, Taipei and other cities.

In the wake of September 11, 2001, Milarepa organized New Yorkers Against Violence, a benefit headlined by Beastie Boys at New York’s Hammerstein Ballroom, with net proceeds disbursed to the New York Women’s Foundation Disaster Relief Fund and the New York Association for New Americans (NYANA) September 11th Fund for New Americans–each chosen for their efforts on behalf of 9/11 victims least likely to receive help from other sources.

Under the alias of Nathanial Hörnblowér, Yauch directed iconic Beastie Boys videos including “So Whatcha Want,” “Intergalactic,” “Body Movin” and “Ch-Check It Out.” Under his own name, Yauch directed last year’s Fight For Your Right Revisited, an extended video for “Make Some Noise” from Beastie Boys’ Hot Sauce Committee Part Two, starring Elijah Wood, Danny McBride and Seth Rogen as the 1986 Beastie Boys, making their way through a half hour of cameo-studded misadventures before squaring off against Jack Black, Will Ferrell and John C. Reilly as Beastie Boys of the future.

Yauch’s passion and talent for filmmaking led to his founding of Oscilloscope Laboratories, which in 2008 released his directorial film debut, the basketball documentary Gunnin’ For That #1 Spot and has since become a major force in independent video distribution, amassing a catalogue of such acclaimed titles as Kelly Reichardt’s Wendy and Lucy, Oren Moverman’s The Messenger, Banksy’s Exit Through The Gift Shop, Lance Bangs and Spike Jonze’s Tell Them Anything You Want: A Portrait Of Maurice Sendak, and many more.

Yauch is survived by his wife Dechen and his daughter Tenzin Losel, as well as his parents Frances and Noel Yauch.

The Beastie Boys were inducted into the Rock and Roll Hall of Fame earlier this year but due to MCA’s illness they were unable to perform. However The Roots, Gym Class Heros and Kid Rock were able to perform as a tribute. The Rock and Roll Special will air tomorrow on HBO and has a somewhat new meaning after today’s tragedy.