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.

Learn how Malcolm-Jamal Warner died at 54 in a tragic drowning accident in Costa Rica. Get verified details about the Cosby Show star's death, career highlights, and the entertainment world's reaction to losing Theo Huxtable.

Some of the greatest lessons about growing up and what it means to be an adult I learned from—or, rather, through—Theo Huxtable. The middle-child sibling on The Cosby Show, Theo was a conduit for the modern teenager in the ’80s and ’90s: a sense of entitlement and arrogance permeating the usual haplessness that accompany coming of age.