Colorado police said Wednesday that there are “no known suspects” in the murder of Tom Clements, the state’s director of corrections chief, who was shot dead when answering the door at his house Tuesday night. A spokesman for the El Paso County Sheriff’s Department, Lt. Jeff Kramer, said there is no evidence that it was a robbery, but that a random killing has not been ruled out. Kramer said authorities are searching for a “boxy” late-model two-door car that a neighbor saw outside Clements’s home at the time of the shooting. While Gov. John Hickenlooper and other state officials praised Clements’s public service, not all his decisions were popular—in fact, he had been at the center of the controversial decision about which prisons to close.