The actor, who died Sunday at 54, was best known for his role as Theo Huxtable, the only son of Cliff and Clair Huxtable, who was based on creator Bill Cosby's son.

Mr. Warner, who played the only son of Bill Cosby’s character on the beloved 1980s sitcom, drowned in Costa Rica.

The Cosby Show star, Malcolm-Jamal Warner, who played Theo Huxtable in the iconic NBC sitcom, has tragically died by 'accidental drowning' in fresh heartbreak for the show