Malcolm-Jamal Warner's mother, Pamela Warner, is opening up about the death of her son.

Warner, best known for his role as Theodore Huxtable on "The Cosby Show," died off the coast of Costa Rica in July after drowning.

The actor was brought to shore by a volunteer lifeguard and another surfer, police said at the time. The Forensic Pathology Department ruled Warner's death as accidental.

'They were in the water, I think maybe chest-deep at, even at that," Pamela Warner told " Good Morning America " co-anchor Robin Roberts in an exclusive interview. "Maybe waist-deep. There was an undertow and my son was not an experienced swimmer. He did not know how to deal with an undertow."

Warner's mother also clarified conflicting details surrounding his death, which reports previously stated

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