(Lake Prairie Township, MN) — A man is dead after his farm tractor collided with a semi on Highway 169 near St. Peter Wednesday morning. Police say 58-year-old Mark Osborne was driving the machine at Mile Post 71 in Lake Prairie Township when it crashed with the semi-truck. He died at the scene, while the semi driver was left uninjured. Troopers are still investigating the cause of the collision.