Updated: Depression dogged Chattanooga gunman

Deborah Wyatt Boen, right, mother of U.S. Marine Corps Staff Sgt. David Wyatt, and Deanna Wyatt Trent, his sister, mourn at a Lee Highway memorial for Staff Sgt. Wyatt and other victims of the July, 16 shootings on Saturday, July 18, 2015, in Chattanooga, Tenn. U.S. Navy Petty Officer Randall Smith died Saturday from wounds sustained when gunman Mohammad Youssef Abdulazeez shot and killed four U.S. Marines and wounded two others and a Chattanooga police officer at the Naval Operational Support Center on Amnicola Highway shortly after firing into the Armed Forces Career Center on Lee Highway. / Staff photo by Doug Strickland

CHATTANOOGA, Tenn. (AP) - The Kuwait-born man who killed five service members was first treated by a child psychiatrist for depression when he was 12 or 13 years old, fought drug and alcohol abuse in later years and went to Jordan last year to clean up, a person close to the family said.

Relatives of Muhammad Youssef Abdulazeez, 24, believe those personal struggles are at the heart of last week's killings at a pair of military sites in Chattanooga, the person said Sunday on the condition of anonymity to avoid unwanted publicity.

"They do not know of anything else to explain it," said the person, who has been in contact with the family several times since the shootings Thursday.

The family's explanation fits a pattern of behavior by Abdulazeez that includes a drunken driving arrest earlier this year and the loss of a job over a failed drug test.