By Jim Melwert

BENSALEM, Pa. (CBS) — A 57-year-old man has been found guilty of the 1984 murder of a 14-year-old Bensalem girl.

In a non-jury trial, Bucks County Judge Wallace Bateman found George Shaw guilty of third-degree murder, not guilty of rape, but of the less serious attempted indecent assault.

Trial Continues For Man Accused Of 1984 Bensalem Rape And Murder 

It wasn’t until 2015 that Shaw was charged with suffocating 14-year-old Barbara Rowan in August, 1984. Bucks County prosecutor Jen Shorn credits years of police work, including Detective Chris McMullin, who picked up the case 20 years after it happened.

“In 2004, Detective McMullin was injured on duty and was reviewing cold cases when he discovered this case had merit and we could prove this case,” Shorn said.

Fla. Man Heads To Trial For 1984 Rape, Murder Of Bucks County Teen

McMullin and Detective Mike Mosiniak got Robert Sanders to confess to helping Shaw dump the body after shooting methamphetamines at Shaw’s Bensalem apartment.

Shaw will face the 1984 maximum sentence for third-degree murder, 10-20 years in state prison.

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