Bill Cosby is mourning the death of his longtime co-star and on-screen son, Malcolm-Jamal Warner, who died at the age of 54 while on a family vacation in Costa Rica. Warner, who rose to fame as Theo Huxtable on "The Cosby Show," died on Sunday, July 20, as he left behind a legacy celebrated by his fans and co-stars.

Actor and director Malcolm-Jamal Warner, best known for his role on "The Cosby Show," has died at age 54 in an accidental drowning in Costa Rica, officials said.

Kelley gave credit to the late actor for pushing for diverse portrayals of Black characters on-screen.