Malcolm-Jamal Warner was an actor I always greatly admired, which is why I was not only shocked but also deeply upset by his sudden passing at 54 from a drowning incident.

Hollywood is mourning the death of Malcolm-Jamal Warner, who is beloved for his portrayal of Theo Huxtable on " The Cosby Show ."

Warner died in a drowning accident in Costa Rica, where he was on vacation with his family, the source said.