LOS ANGELES, California (CNN) -- George Carlin, the influential comedian whose routines used profanity, scatology and absurdity to point out the silliness and hypocrisy of human life, has died. He was 71. Carlin, who had a history of heart trouble, died of heart failure Sunday, according to publicist Jeff Abraham. Carlin went to St. John's Health Center in Santa Monica on Sunday afternoon, complaining of chest pain, and died at 5:55 p.m. PT. Carlin performed as recently as last weekend at the Orleans Casino and Hotel in Las Vegas, Nevada, and maintained a busy performing schedule, which included regular TV specials for HBO. "He was a genius and I will miss him dearly," Jack Burns, who was the other half of a comedy duo with Carlin in the early 1960s, told The Associated Press. Carlin was "a hugely influential force in stand-up comedy. He had an amazing mind, and his humor was brave, and always challenging us to look at ourselves and question our belief systems, while being...