Colorado authorities are looking for a dark-colored “boxy” car seen near the house of the state’s head of Corrections Department who was shot when he answered the door.

The vehicle’s engine was running and a witness reported seeing one person driving away in the car.

Tom Clements was shot around 8:30 p.m. Tuesday in Monument, north of Colorado Springs.

Authorities say investigators have not ruled anything out, but it could have been related to his job.

Gov. John Hickenlooper appointed Clements to the post in 2011 after he served for more than three decades in the Missouri Department of Corrections.

Hickenlooper was red-eyed and somber Wednesday morning at a news conference in which he said he doesn’t think the killing was part of any larger attack against his cabinet.