Image Credit: FOX Image Collection via Getty I Malcolm-Jamal Warner, best known for playing Theo in The Cosby Show, died while on a vacation in Costa Rica, multiple outlets reported on July 21, 2025. Since Warner didn't have any well-known health issues, fans of the late actor are wondering what his cause of death was. Below, get updates on Warner's death and everything we know about the incident so far. Who Is Malcolm-Jamal Warner? Warner was best known for playing Theodore "Theo" Huxtable on The Cosby Show from 1984 to 1992.