A Green Valley man was killed in an ATV accident Saturday morning southwest of Tucson.

At about 11:40 a.m. Terry Duncan, 68, was riding an all-terrain vehicle in a desert area about 10 miles southwest of Green Valley when he drove down a steep hill, fell off the ATV and hit his head on the ground, according to a news release from the Pima County Sheriff’s Department.

A friend riding another ATV tried to revive Duncan, but he was pronounced at the scene. Duncan was not wearing a helmet.

There is no indication drugs or alcohol were a factor in the accident, the news release stated.

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