This is so sad.

One of the co-founding members of the famous hip-hop group the Beastie Boys has died, according to Rolling Stone Magazine.

Adam Yauch, also known as MCA, had reportedly been battling cancer since 2009 when a tumour was discovered in a salivary gland.

The Beastie Boys, made up of Yauch, Mike “Mike D” Diamond and Adam “Ad-Rock” Horowitz, hit the music scene in 1979.

Our condolences go out to his friends and family.