One person was killed, two others seriously injured in a head-on collision on Highway 65 in Sedalia Saturday night.   According to the highway patrol, Thomas Belanger, 47, of Warsaw, was heading south when he crossed the centerline and hit Joshua Groves, 20, of Sedalia.  Both Belanger and Groves were flown to University Hospital in Columbia.  Groves’ passenger, Brandon Debates, 20, of Warsaw, was pronounced dead at the scene.  The investigation continues.