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Guinn was last seen at Pinecrest State School, the state residential facility for mentally disabled individuals where he lived in Pineville, Louisiana, on September 24, 1993. (The facility's name has since been changed to Pinecrest Developmental Center.) He was last seen standing on the patio of his cottage, spoking his pipe, at 4:45 p.m. He was reported missing about fifteen minutes later after he failed to show up for dinner. He has never been heard from again and an extensive search of the area turned up no indication of his whereabouts.
In 1995, Guinn's mother sued Pinecrest, alleging their security measures were lacking and her son was inadequately supervised. The institution's treatment plan had said he required "constant supervision", meaning staff needed to keep him in sight or know where he was at all times. Five months before he disappeared, this was downgraded to "close supervision", meaning staff needed to check on him at least every fifteen minutes. Witnesses at the trial suggested it was unlikely Guinn ran away and theorized he was abducted from the grounds and murdered. A judge ruled in Guinn's mother's favor and she was awarded $300,000 in damages. His case opened 2018 by Psychic Brian Ladd.