The Oklahoma Highway Patrol is looking for man and two juveniles in its investigation of a tombstone thrown from an overpass into a tractor-trailer rig.

The stone was thrown from an overpass over the Cherokee Turnpike near Locust Grove on June 12 and crashed through the windshield of a rig driven by Gerald Webb, 66, of Porum, Okla.

Webb remains hospitalized in serious condition with a broken arm and collapsed lung.

Troopers are looking for Jeremy McGirt, 20, of Locust Grove as a person of interest.

Two juveniles are also wanted for questioning, OHP said. Their names haven't been released.