GREEN VALLEY, Ariz. -- A man who lost control of his all-terrain vehicle while riding in the southern Arizona desert has died.
The Pima County Sheriff's Office said deputies responded Saturday around 11:40 a.m. to an area near Green Valley, about 10 miles southwest of Mission and McGee Ranch roads.
They said 68-year-old Terry Duncan and a friend were riding when Duncan lost control and hit his head.
The friend attempted life-saving measures but Duncan was unresponsive.
Authorities said Duncan was not wearing a helmet. Neither alcohol nor drugs is believed to be a factor in the incident.