A 22-year old Saint Robert man and a 28-year old Barnhart man were killed in a head-on collision Friday afternoon in Osage County. The Missouri Highway Patrol reports that a pickup driven by 22-year old Kale S. Durr of Saint Robert was traveling west on Highway 50 about a mile east of route N when he tried to pass a tractor-trailer in the eastbound lane and struck a pickup driven by 28-year old Zachary M. Patchin of Barnhart, head-on. Both drivers were pronounced dead at the scene.