FORT LAUDERDALE, FL (AP/NBC NEWS) — The brother of the man who has been tentatively named as the suspect in a deadly shooting at a Florida airport says the suspect had been receiving psychological treatment while living in Alaska.

Bryan Santiago tells The Associated Press that his family got a call in recent months from 26-year-old Esteban Santiago’s girlfriend alerting them to the situation.

Esteban was “fighting with a lot of people” during his time in Alaska, Bryan Santiago told NBC News, saying he was having relationship issues and arguing with his girlfriend and others. The girlfriend told Bryan that his brother was “receiving psychological counseling in Anchorage.”

Bryan Santiago said he didn’t know what his brother was being treated for and that they never talked about it over the phone.

He said Esteban Santiago was born in New Jersey but moved to the U.S. territory of Puerto Rico when he was 2 years old. He said Esteban Santiago grew up in the southern coastal town of Penuelas and served with the island’s National Guard for a couple of years. He was deployed to Iraq in 2010 and spent a year there with the 130th Engineer Battalion, the 1013th engineer company out of Aguadilla, according to Puerto Rico National Guard spokesman Maj. Paul Dahlen.

Sources said Santiago took Delta flight no. 1088 from Anchorage to Minneapolis-St. Paul Thursday night. He landed Friday morning, and then took Delta flight no. 2182 from Minneapolis-St. Paul to Fort Lauderdale.

Sen. Bill Nelson of Florida said that the gunman was carrying a military ID that identified him as Esteban Santiago, but that it was unclear whether the ID was his. Nelson gave no further information on the suspect.

Alaskan court records show an Esteban Santiago with the same date of birth was charged with two misdemeanors last year; one count was dismissed and Santiago was due back in court on the second this coming March.

CNN reports that Santiago went to the FBI office in Anchorage several months ago. He said he was hearing voices in his head, including some telling him to join ISIS. Santiago was taken to a hospital for a mental health evaluation, the officials said.