PRINCETON — A man was killed while he was working on a tractor-trailer in Princeton this morning, police said.

Grant Cilley, 44, of Princeton, had jacked up the cab of a truck and was attempting to set a second pair of jacks underneath when the truck came off the first pair of jacks and crushed him, said Maine Department of Public Safety spokesman Stephen McCausland.

Cilley had been working on the truck in the yard of a family business on Main Street in Princeton at 10 a.m. Sunday when the accident took place.