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DOYLESTOWN, Pa—A Pennsylvania jury will decide on life or death for a Pennsylvania man who pleaded guilty in the 2016 rape, murder and dismemberment of his girlfriend’s teenage daughter.Jacob Sullivan, 46, pleaded guilty to all charges last month in a case that raised questions about the child welfare system’s failure to protect 14-year-old Grace Packer, who spent years in an abusive home before she was sexually violated, drugged and then, finally, strangled in the attic of a suburban Philadelphia home.