One person is dead after a reported chase involving Richardson and Dallas police that ended near the High Five exchange on Monday afternoon, police confirm. A police source told NBC 5 that one person in a vehicle had died. There was no further information given about the person, including their name or what killed them. A small crossover SUV was seen at the scene, stopped and straddling a curb with all four doors open. A Richardson police SUV at the scene had a flat tire. Video from Texas Sky Ranger showed a large number of police officers stopped near a Central Expressway entrance ramp along the Dallas-Richardson border, and at least two people, including a woman and a child, walked over and got into an ambulance. NBC 5 contacted the Richardson Police Department but has not yet received a reply. Dallas police confirmed to NBC 5 that they were assisting in the chase. The southbound U.S. Highway 75 Service Road between 75 and North Central Expressway and Interstate 635/Lyndon B Johnson Freeway is closed, leading to traffic delays. The police activity has backed up southbound traffic on 75 past Campbell Road. Check back and refresh this page for the latest update. As developments unfold, elements of this story may change.