The man believed to have carried out a gun attack at Los Angeles International Airport could be facing the death penalty if convicted of the charges against him.

Paul Ciancia, 23, has been charged with murder of a federal agent, violence at an international airport and multiple other charges. He remains hospitalized after being shot in the mouth and legs by police.

LAX has reopened fully after the investigation on-site was completed.

Police reported that the gunman did not initially kill 39-year-old TSA agent Gerardo Hernandez, the first TSA agent killed in the line of duty. Ciancia had wounded Hernandez before shooting at other agents then returned to kill the fallen agent.

The FBI says Ciancia carried a handwritten note stating he made the conscious decision to kill TSA employees to “instill fear into their traitorous minds.”

He pushed through screening gates and was 100 yards into the secure area before law enforcement reached him and he opened fire near a food court.