(AP) — Oklahoma investigators have not concluded whether a truck driver's inattention was the cause of a highway collision that killed four members of a Texas community college women's softball team. The driver of the trailer, 53-year-old Russell Staley of Saginaw, Texas, was headed north on Interstate 35 in Oklahoma when his 18-wheel tractor-trailer veered into a median and into the southbound lanes. Staley declined to comment Monday when The Associated Press reached him by telephone, and Oklahoma Highway Patrol officials again would not say what Staley told them. Oklahoma Highway Patrol Capt.