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.

New details about the circumstances of “Cosby Show” star Malcolm-Jamal Warner’s death have emerged.

“Two people who were there at the location went in with a surfboard and a boogie board to help rescue [Malcolm and his daughter] caught in the current,” Costa Rica’s Atlantic head of Tourist Police, E...