Police in Colorado are searching for the gunman who walked up to the front door of the head of the state Department of Corrections; rang the doorbell; and gunned him down.

Investigators say robbery was probably not the motive in the killing of Tom Clements, who oversaw more than 20 thousand inmates in Colorado’s prisons and parole system, and that his work might have made him a target.  Clements had actually come out of retirement after doing the same job in Missouri.

But Clements was also supportive of new gun control legislation that Colorado Governor John Hickenlooper signed into law the morning after the murder. 

The new laws call for background checks for private gun sales.  Background checks are already required for gun sales at stores and gun shows.  They also ban ammunition magazines with more than 15 rounds, which were used in the Aurora, Colorado Theater Massacre in July 2012, and the Sandy Hook School Massacre in December of last year.