@abcnews: Malcolm-Jamal Warner, the actor perhaps best known for starring in the TV sitcom "The Cosby Show" as son Theodore "Theo" Huxtable, has died. He was 54. Warner drowned off the coast of Costa Rica on Sunday, Costa Rican National Police told ABC News. In 2013, Warner told the Archive of American Television that his "proudest achievement" in life was "being able to have a post-Cosby life and post-Cosby career and still have my head on as straight as possible." "I've had such an awesome life," he said at the time. "I've got my ups and downs and all of that, but if I die tomorrow, I know I would go with a smile on my face."