ERIE — A woman was sentenced Monday to spend the rest of her life in prison for a bank robbery plot in which a pizza delivery driver was killed by a bomb locked around his neck — even though both she and the victim’s family claim that she’s innocent.

Marjorie Diehl-Armstrong, the mentally ill Erie woman, was sentenced to life plus 30 years in prison in the bank robbery plot that killed 46-year-old Brian Wells on Aug. 28, 2003.

Diehl-Armstrong, 62, already in prison for a slaying two weeks before Wells’ death, has denied involvement in the plot. And Wells’ sister, Jean Heid, supported her claim before Diehl-Armstrong was sentenced.

Heid reiterated the family’s belief that Diehl-Armstrong was just a pawn and that Wells wasn’t a co-conspirator, as federal prosecutors allege.

“My heart goes out to the family,” Diehl-Armstrong said before she was sentenced. “The true killer is still out there.”

Prosecutors contend Diehl-Armstrong and others plotted to lock the bomb onto Wells’ neck, then sent him to rob a PNC Bank in neighboring Millcreek Township because Diehl-Armstrong wanted to hire her fishing buddy, Kenneth Barnes, to kill her father.