The suspected Aurora, Illinois gunman owns his weapon illegally.

So the gunman involved in the shooting had his firearm owner identification card revoked by state police in March 2014.

Aurora police chief Kristen Ziman told media Saturday that investigators were looking into how Martin “had access to a firearm he shouldn’t have had access to,” as it appeared despite his lengthy legal history in the state, he fell between the cracks for police monitoring of gun ownership. State guidelines stipulate that after the card is revoked, the person must submit details to state police on the guns they own and identify another valid FOID holder who will hold the guns during the revocation

Upon revocation, state authorities notify local police, who likely won’t seize guns from the former FOID holder unless they fail to submit the form, which is a misdemeanor and allows police to search for and seize the guns, but wasreported by the Chicago Tribune to be a rarity unless the person is stopped for some other violation.

Martin was a longtime assembly worker at the valve plant who was going to be fired from his jobon the day of the attack. He reportedly showed up to a meeting with a Smith & Wesson handgun, and initially opened fire on the executives in the meeting room before targeting those who were at work on the plant floor.