Flagstaff Police and DPS are investigating a fatal collision that occurred in Flagstaff last night evening. Sgt. Cory Runge says the incident involved a pedestrian and a tractor trailer on I-40 westbound at North 4th Street. Runge says the collision resulted in the death of 22-year old Logan Flake of Flagstaff. Initial investigation indicates Flake committed suicide by jumping from the Fourth Street Overpass into oncoming westbound traffic before being struck by a commercial truck with a travel trailer.A suicide note was found in Flake’s possession and Runge says several witnesses attempted to convince him not to jump from the overpass. Traffic was affected for an extended period of time. Though the investigation is ongoing, no civil or criminal actions were cited by vehicle driver that contributed to the collision.