A postal worker has been shot and killed while delivering mail in Prince George's County, Maryland, on Saturday evening. Police have identified the victim as 26-year-old Tyson Jerome Barnette of Upper Marlboro. Authorities are still trying to identify suspects and a motive in the case. Officers were called to Reed Street in Cheverly-Landover just after 7.20pm on Saturday and found Barnette suffering from gunshot wounds. He was pronounced dead at the scene.