Esteban Santiago Had One-Way Ticket to Fort Lauderdale

Esteban Santiago bought the Delta Air Lines ticket last Tuesday, according to a person familiar with the case.
2:31 | 01/09/17

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Transcript for Esteban Santiago Had One-Way Ticket to Fort Lauderdale
Next tonight, new images of the deadly airport shooting in ft. Lauderdale. Video by TMZ shows the suspect walking through baggage claim, appearing to fire at random. Five people killed. The alleged gunman due in court tomorrow. His family says the FBI could have prevented the shooting, saying authorities missed the warning signs. Tonight what our chief investigative reporter Brian Ross is finding out about that alleged shooter and ISIS. Reporter: The attack came without warning, as seen on this airport surveillance video, obtained by TMZ. 26-year-old Esteban Santiago pulls out his pistol and opens fire. Passengers run for cover as Santiago moves out of camera range, through the baggage claim section, where police say he emptied his nine millimeter semi-automatic handgun, and then reloaded once, and killing five people and injured six more. Tonight, the question is why a man who told the FBI he was hearing voices about ISIS, thought the government had put a chip in his head, was able to keep his gun even after being hospitalized for a mental examination. The gun was taken away from him. It was given back after he was cleared. Reporter: A question put to the Broward county sheriff Scott Israel. Do you think he should have had that gun? Well, no. Reporter: There are also questions tonight why FBI agents in Anchorage, Alaska, did not put Santiago on a no-fly list after he showed up claiming he was hearing voices. I want to be clear, during out initial investigation, we found no ties to terrorism. Reporter: But after being arrested Friday, Santiago claimed to FBI agents he had actually been in contact with ISIS online. And now, after recovering Santiago's computer from an Alaska pawn shop, FBI agents are investigating whether Santiago created a jihadist identity for himself, several years ago under the name of aashiq hammad. Santiago's brother, in Puerto Rico, told ABC news, the FBI should have done more sooner. The mistake was theirs, said Bryan Santiago. They knew this for two or three months. Brian Ross joins us on set now. Do we know more about the shooter and the planning of his alleged attack? Well, he made his plans to go to ft. Lauderdale a few days ago. He bought his ticket just last Tuesday. Saying he was going to visit a stepbrother in ft. Lauderdale. Tom? Brian Ross, thank you. We are learning more about the victims.

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

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