The killing of Tom Clements, 58, director of the Colorado prison system, triggered a massive investigation and prompted extraordinary safety precautions around the state in case the killer targets other government officials, the Denver Post reports. Clements was shot Tuesday night by someone who rang the doorbell at his home; robbery was not an apparent motive. Clements was praised for innovations that helped cut Colorado’s recidivism rate and dramatically reduced the number of inmates in segregation. Not all of his changes have been popular among the rank-and-file. Two prisons closed under his watch, and he would soon have been involved in deciding which other prisons to close in response to a falling prison population. A week before Clements’ death, he denied a request by a Saudi national, Homaidan al-Turki, to serve out the remainder of a Colorado prison sentence in Saudi Arabia. He cited al-Turki’s refusal to undergo sex-offender treatment.