Memphis police on Tuesday charged a 53-year-old man with aggravated assault and resisting being frisked after the man used keys to stab an officer in the head in East Memphis.

Robert Shaw, of Memphis, was held in Shelby County Jail on $15,000 bond.

Responding to a report of a possible prowler near Gwynne and Shady Grove about 11:45 a.m., Officer Thomas Walters encountered Shaw walking north on Mendenhall at Walnut Grove, according to a court affidavit.

Shaw was clutching keys and Walters told him to put them down when he attempted to frisk Shaw.

Shaw used the keys as a weapon, grabbing the officer in a headlock and stabbing him in the head. Walters managed to use his radio to summon help, the report said.

When other officers arrived, Shaw still refused to drop the keys or put his hands behind his back and kept trying to reach a metal object in his left pocket that officers thought might have been a gun.

They managed to subdue Shaw and found that the object in his pocket was a metal door handle.

Walters was treated at Baptist Memorial Hospital-Memphis.