Anne Winters Carter

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Anne Winters Carter (right) comforts her daughter, Teresa Carter, at a vigil for their grandson and son, Chavis Carter, in Memphis, Tenn., on Monday. Chavis Carter, a man police say fatally shot himself in the head while his hands were cuffed behind him in the back of an Arkansas patrol car, tested positive for anti-anxiety medication, according to an autopsy report released Monday that listed his death as a suicide.