Malcolm-Jamal Warner, who played Theo Huxtable on "The Cosby Show," has died at 54, with Bill Cosby reflecting on their relationship and Warner's professionalism on set.

Malcolm-Jamal Warner’s “Cosby Show” family is mourning his death. Warner died at age 54 on Sunday, July 20, after drowning near a beach in Limón, Costa Rica. The actor was best known for playing Theodore Huxtable on all eight seasons of “The Cosby Show,” which aired from 1984-1992.