R.I.P. George Carlin

A publicist for George Carlin says the legendary comedian has died of heart failure at a hospital in Santa Monica, Calif.

Jeff Abraham says Carlin went into St. John's Health Center on Sunday afternoon, complaining of chest pain. Carlin died at 5:55 p.m. PDT. He was 71.

Carlin, who had a history of heart trouble, performed as recently as last weekend at the Orleans Casino and Hotel in Las Vegas. It was announced Tuesday that Carlin was being awarded the 11th annual Mark Twain Prize for American Humor.