ERIE, Pa. (AP) – A defense attorney says his client will plead guilty to conspiracy in a bizarre 2003 bank robbery that led to the collar-bomb death of a Pennsylvania pizza delivery man.

Attorney Jamie Mead of Erie said Friday that Kenneth Barnes will plead guilty Wednesday to his role in planning the heist.

Delivery man Brian Wells told police he had been forced at gunpoint to wear a bomb around his neck and rob the bank. Wells was killed when the device exploded as police waited for the bomb squad.

Marjorie Diehl-Armstrong is accused of masterminding the plot. A federal judge last month ruled that she’s not mentally competent to stand trial, but that could change depending on how she responds to medication and treatment.