Here's the story from NewsOK.com:
BLACKWELL — A Blackwell man died after a tractor-trailer struck him while he was helping a motorist on a highway near Blackwell in late Tuesday, authorities said.
Gale Ray Pemberton, 61, died at a Blackwell hospital.
Paul Dukich, 68, of Witchita, Kan., was driving a tractor-trailer south on Interstate 35 about 3 miles south of Blackwell when the rig changed lanes and struck Pemberton about 10 p.m. Tuesday, according to the Oklahoma Highway Patrol. Pemberton, a wrecker service driver, was out of his vehicle helping a motorist.
Dukich was not hurt. He was wearing a seat belt, troopers said.