Pimp C -- one half of hip-hop duo UGK -- was found dead at the Mondrian Hotel in West Hollywood, California, according to TMZ. L.A. County Fire responded to a 911 call at the trendy hotel this morning, only to find the 33-year-old rapper, whose real name is Chad Butler, dead in his bed.

There's no official word on what caused Pimp C's death, but the rapper was last seen performing at the L.A. House of Blues with Too Short on Saturday night.

It's been nearly two years since the Texas-bred rapper bounced back on the scene after serving four years of an eight year sentence for an aggravated assault charge.

UGK is best known for guest appearances on Jay-Z's 1999 hit 'Big Pimpin'' and Three 6 Mafia's underground hit 'Sippin on Some Syrup.' Three 6 Mafia's DJ Paul and Juicy J returned the favor and produced UGK's recent hit, 'International Player's Anthem (I Choose You),' featuring OutKast, off their much-delayed album, 'UGK (Underground Kingz).'