New Delhi, July 23 -- Malcolm-Jamal Warner, who as teenage son Theo Huxtable on "The Cosby Show" was central to a cultural phenomenon that helped define the 1980s, died at 54 in an accidental drowning in Costa Rica, authorities there said Monday.

Costa Rica's Judicial Investigation Department said Warner drowned Sunday afternoon on a beach on Costa Rica's Caribbean coast. He was swimming at Playa Cocles in Limon province when a current pulled him deeper into the ocean.

"He was rescued by people on the beach," the department's initial report said, but first responders from Costa Rica's Red Cross found him without vital signs and he was taken to the morgue.

Warner created many TV moments etched in the memories of Generation X children an...