Investigators said Ciancia walked into LAX’s Terminal 3, pulled out an assault rifle from a duffel bag and fired repeatedly at TSA Officer Gerardo Hernandez.
An autopsy showed Hernandez, 39, was shot a dozen times.
Ciancia then fired on two other uniformed TSA employees and an airline passenger, who all were wounded, as he moved through the security checkpoint to the passenger gate area, authorities said.
Airport police shot Ciancia as panicked travelers either hid or fled.
Investigators have said Ciancia had a vendetta against the federal government and targeted TSA officers.
His attorneys, who are both deputy federal public defenders, declined to discuss the case after the hearing.