Authorities spent the weekend re-constructing Friday's shooting spree at the Los Angeles international airport.
One security officer was killed and two others wounded by a gunman who had it in for the TSA.
Now police know *how* the crime happened --but not why.
ABC's Brandi Hitt picks up the story.
Paul Ciancia - the suspected l-a-x gunman - arrived at the airport on Friday like a regular passenger.
ABC news has learned a roommate dropped him off at terminal 3 unaware of his friend's deadly plan
According to the criminal complaint surveillance video shows Ciancia walking up the t-s-a checkpoint pulling out a Smith and Wesson assault rifle
And shooting TSA officer -Gerardo Hernandez - at point blank range.
The document also says the gunman walked away but when he saw the wounded officer moving he came back and shot him again, killing him.
As we know this is the first TSA employee killed in the line of duty.
It is a significant event.
The FBI says Ciancia shot his way through the terminal wounding two other officers and teacher - Brian Ludmer - who was shot in a leg.
He dragged himself into nearby closet inside the closet he found a sweatshirt which he used as a tourniquet wrapped it around his thigh to stop the blood.
After airport police shot Ciancia 4 times they found his bag which contained 5 magazines full of ammunition... and a handwritten note addressed to the TSA saying he hoped "to instill fear on your traitorous minds."
He made a conscious decision to kill multiple TSA employees classmates at Ciancia's Delaware High School -- where he played the French horn - said he was a loner.. And a former roommate -not the one police say dropped him at the airport --called Ciancia "a nice guy."
"Introvert... but nothing that I wild ever expect him to do something "he said he was going back to new jersey, going to work for his dad, making amends with family problems, and spending holidays with his family.
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