Porter was behind the wheel of a 2009 Nissan Rogue that was stopped in the middle of the road, Madison said. It is not clear why the Nissan stopped, he added.
At some point, a tractor-trailer smashed into the stopped SUV, Madison said. The driver of the tractor-trailer, identified by police as 52-year-old Linder Rice, was not hurt in the crash, Madison said.
An investigation is ongoing.