The Latest on the fate of a Pennsylvania man who authorities say raped, murdered and dismembered his girlfriend's daughter (all times local):

10:45 a.m.

A hearing is underway to determine whether a Pennsylvania man who pleaded guilty in the 2016 rape, murder and dismemberment of his girlfriend's teenage daughter will get life or death.

The penalty phase of Jacob Sullivan's trial opened Friday outside Philadelphia. The 46-year-old pleaded guilty to all charges in the 2016 death of 14-year-old Grace Packer. A jury will hear testimony about Sullivan's crimes before deciding on a sentence of either life in prison or death.

Prosecutors have said Grace's adoptive mother, Sara Packer, watched Sullivan act out a rape-murder fantasy they shared. Sara Packer has agreed to plead guilty in the case in exchange for a life sentence.

Sullivan was Sara Packer's boyfriend. His attorneys plan to argue she masterminded the plot.

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1:05 a.m.

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.

Forty-six-year-old Jacob Sullivan pleaded guilty to all charges in the 2016 death of Grace Packer. The penalty phase of his trial opens Friday outside Philadelphia. A jury will hear testimony about Sullivan's crimes before deciding on a sentence of either life in prison or death.

Prosecutors have said that Grace's adoptive mother, Sara Packer, watched Sullivan act out a rape-murder fantasy they shared. Sara Packer has agreed to plead guilty in the case in exchange for a life sentence.

Sullivan was Sara Packer's boyfriend. His attorneys plan to argue that she masterminded the plot.