Officials say a Nashville police officer was killed when he was struck by a motor home on Interstate 65. The Metropolitan Nashville Police Department said Officer Michael Petrina was directing traffic on the interstate after a vehicle overturned Saturday morning, May 10, 2014. Police spokesman Don Aaron said the driver of a motor home, identified as 71-year-old Dean Joseph Diver of Key Largo, Florida, hit Petrina. The officer died at the scene.