 Around 5 yesterday morning, state prison officials say Corporal Robert Sumner was headed to work at a hospital shift in Edmond at the same time that Corporal Andrew Freppon was headed the opposite way to Bowley to work his normal shift at John Lilly Correctional Center. Troopers say they don't know why yet, but Sumner's state-issued minivan collided with Freppon's personal vehicle, a pickup truck, on Highway 62 about a mile east of Meeker.