Fort Lauderdale Shooting Suspect Esteban Santiago to Appear in Court

Details of the shooting victims are emerging hours before Esteban Santiago is to appear in court.
2:53 | 01/09/17

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Transcript for Fort Lauderdale Shooting Suspect Esteban Santiago to Appear in Court
Now to chilling new images of that deadly airport shooting in Florida. This video obtained by TMZ shows a man calmly walking through baggage claim before pulling a gun and opening fire. ABC's chief investigative correspondent Brian Ross joins us with new details. Good morning, Brian. Reporter: Good morning, the accused shooter will be in court later this morning on federal murder charges held all weekend under a suicide watch with the FBI trying to determine if his claim to have been in contact with ISIS is fantasy or fact. The attack came without warning as seen on this airport surveillance video obtained by TMZ coming into view from the left 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 9 millimeter semiautomatic handgun and then reloaded once and killed five people. Many of them arriving for a cruise ship vacation. Among the dead, 84-year-old Olga woltering of Georgia, killed next to her husband. There were such a wonderful, warm pair and they meant the world to all of us. Reporter: And Michael oehme of Iowa shot dead in front of his wife Carrie one of the six injured and now the question is why Santiago even had a gun which had been taken away last November when he showed up at the FBI office in Alaska to claim he was hearing voices about ISIS and was hospitalized for a mental examination. The gun was taken away from him but was given back after he was cleared. Reporter: 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 pawnshop, FBI agents are investigating whether that's true and whether Santiago created a jihadist identity for himself several years ago under the name of aashiq Muhammad. Overnight a former girlfriend told ABC news he returned from deployment deeply troubled after saying he saw two of his National Guard buddies killed in action but could not get help from the veterans administration. Started acting weird when he was in Puerto Rico and had let veterans know he was having some problems and wasn't feeling right and they did nothing. Reporter: Santiago had no problem legally checking his gun as airplane baggage. He arrived at 1:1 frid2:11 and began his rampage 34 minutes later. He only made his plans to go to ft. Lauderdale a few days ago. He bought his one-way $278 delta air lines ticket just last Tuesday, robin. Do investigators have any clear reason why ft. Lauderdale? They're not clear but family members say he had a stepbrother there and thought he was going to visit him.

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

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