Actor and director Malcolm-Jamal Warner, best known for his role on "The Cosby Show," has died in an accidental drowning in Costa Rica, where he was vacationing with his family, officials there said. He was 54.

American actor Malcolm-Jamal Warner, who played Bill Cosby's son Theo on the 1980s groundbreaking television hit The Cosby Show, died by drowning at 54 on Monday, a law enforcement source confirmed to Reuters.

The cause of death of Cosby Show star Malcolm-Jamal Warner has been revealed. Warner drowned off the coast of Costa Rica on Sunday, July 20, Costa Rican National Police told ABC News. His official cause of death was ruled as asphyxia.