After a weekend of intense investigation, authorities are piecing together more details about Friday's fatal shooting at Los Angeles International Airport, including the suspect's behavior earlier in the week and a warning from his family that may have come minutes too late.
About 9:20 a.m. Friday, Ciancia walked up to a Transportation Security Administration checkpoint in Terminal 3. He pulled a .223-caliber assault rifle from a bag and shot TSA officer Gerardo Hernandez "at point-blank range," according to a court document filed by an FBI agent.
Ciancia then went up an escalator but returned to shoot Hernandez again, apparently after seeing him move.
He continued walking and shooting. Witnesses said he went from person to person, asking, "Are you TSA?"
Hernandez, 39, was the first TSA officer to die in the line of duty since the agency was created in 2001.
"He took pride in his duty for the American public and for the TSA mission," said his wife, Ana Hernandez.
The couple, who married in 1998, have two children.
Two other TSA officers - James Speer, 54, and Tony Grigsby, 36 - were wounded but were released from the hospital.
Grigsby, who was shot in the foot, told reporters Monday he was injured while helping an elderly man move to a safe area.
"I turned around and there was a gunman," he said. "Shot me twice."
A traveler who was shot in the leg, 29-year-old Brian Ludmer of Lake Forest, Illinois, was in fair condition Sunday.
Days before Paul Ciancia's murderous rampage at LAX, one woman who knows the alleged gunman and his three roommates says Ciancia was already plotting his crime.
CNN's Miguel Marquez reports.
Woman: He asked one of the roommates if you could have a ride to the airport.
Miguel: Why did he need a ride?
Woman: He said he was going back home. He said his dad was sick and he had to go help take care of him.
MM: Did anyone see a ticket?
Woman: No. He also didn't tell him what day he needed to leave.
She says Ciancia rarely left his San Fernando Valley apartment since moving there in January. Describing him as socially awkward and a heavy smoker, he always paid his rent on time and appeared to make money trading online. The day he put his alleged plan into action, she says, took his roommate by surprise.
Ciancia's roommates believe he texted family members in New Jersey, telling them he was going to commit suicide. That prompted frantic calls between police in NJ and LA. Police came to Ciancia's home.
She says the two other roommates were woken up and handcuffed as police searched the premises. Paul already gone and no sign of a gun.
Woman: At this moment as they are seeing this on the TV, their third roommate comes back and he said "Oh I just dropped off Paul at LAX, he had to go home."
And they just knew and said "I think you just dropped off Paul to a shooting."