PROFILE of US actor Malcolm-Jamal Warner, who played the son in the smash-hit sitcom "The Cosby Show," as authorities in Costa Rica say he drowned. "We received a report of an adult male who died of drowning asphyxiation at Coles Beach in Cahuita" on Sunday afternoon, says a statement from investigating police. Local authorities identified him as the actor, who was 54, and said his body had been transferred to a morgue for further analysis. SHORT PROFILE OF PROFILE OF Actor Malcolm-Jamal Warner