Malcolm-Jamal Warner 's mother, Pamela Warner , is opening up about her son's drowning death in Costa Rica.

Check out her interview with ABC's Robin Roberts -- she recalls the moment she learned the horrible news and how she let out a shriek of "indescribable pain" as neighbors ran over. Gallery Launch Gallery Getty

She also shed light on why "The Cosby Show" actor was in Costa Rica in the first place -- apparently, his 8-year-old daughter was on a trip for an immersive homeschooling experience. His wife and daughter had been there for 3 weeks before it was his time to join for the "fun" part of the trip. Play video content

Pamela said he was about waist-deep when he got dragged out by a strong current, explaining ... "There was an undertow and my son was not an experi

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