Investigation of Ft. Lauderdale Airport Shooting Finds New Details

The suspected shooter faces charges that could carry the death penalty if he is convicted.
2:42 | 01/08/17

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Transcript for Investigation of Ft. Lauderdale Airport Shooting Finds New Details
We'll check back in shortly. To the suspected gunman in the ft. Lauderdale airport shooting. He's facing charges that could carry the weight of death penalty. His gun was confiscate months ago by the FBI but returned shortly thereafter. Eva pilgrim is in Florida with the latest. Reporter: Good morning, Paula. The FBI says they closed their Alaska investigate into the alleged shooter after checking him out, finlding no ties to terrorism. But this morning, a lot of questions about what the FBI could have done to prevent this shooting. According to the FBI, the alleged ft. Lauderdale international airport shooter came to south Florida with one purpose. Indications are that he came here to carry out this horrific attack. Reporter: In a criminal complaint, Santiago told investigators he planned the attack, purchasing a one-way airline ticket. According to the documents filed in federal court Saturday, Santiago said he shot the first people he encountered. Firing 10 to 15 rounds, aiming at his victims' heads. Dozens hurt in the chaos that followed. His demeanor was quiet. Nonemotional. Reporter: FBI agents said his statements were confirmed by security video. As well as by witnesses stories and cell phone videos. This is not Santiago's first encounter with the FBI. In November, the FBI confirming he showed up at the Anchorage office with his newborn in the car saying the FBI is controlling his mind. He broke no laws. There is no indication he was working with any other individuals. When he planned and carried out yesterday's attack. Reporter: According to the FBI, agents contacted local authorities who took Santiago to a mental health facility. The FBI taking the gun at the time. On December 8th, the weapon was released to Santiago. Reporter: This morning, the FBI facing tough questions including from Santiago's family members. His brother telling ABC news the agents should have done more for the 26-year-old Iraq war veteran. Translator: They September him to the psychiatric center. That's it. They failed him. No judge adjudicated him mentally ill. Unfortunate lirks it's this gray zone we have in this country. Reporter: The FBI, at this time, not saying why Santiago chose south Florida for the shooting. They say it's a multistate investigation. They're looking into every place he lived. And everywhere he recently traveled.

This transcript has been automatically generated and may not be 100% accurate.

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