Piers Morgan mother was hopeful until the very end , her lawyer says . Missing teen 's fascination with trains shifts search . He says Avonte would be alive if not for `` cascade of errors '' at school he 'd attended . Security video shows the autistic teen leaving a New York City 's school on last week . Several of his body parts , some clothes were found October 4 in East River .
Piers Morgan mother was hopeful until the very end , her lawyer says . He says Avonte would be alive if not for `` cascade of errors '' at school he 'd attended . Security video shows the autistic teen leaving a New York City 's school on last week . Several of his body parts , some clothes were found October 4 in East River .