ST. PAUL, Minn. (AP) — The Ramsey County Medical Examiner’s Office has ruled a shooting that left two men dead outside a FedEx facility in Mahtomedi last month was a murder-suicide.

Officials say David Peterson killed Todd “Jimmy” Wilemon and then shot himself following an argument Feb. 1. Washington County sheriff’s deputies responding the FedEx parking lot found Wilemon, a 58-year-old Fulton, Mississippi man, was already dead.

Peterson, a 49-year-old man from Blaine, was taken to Regions Hospital in St. Paul where he died. Investigators say the two men were truck drivers and that Wilemon was involved in a relationship with Peterson’s wife.