The 13 people killed when an Army psychiatrist allegedly opened fire on fellow soldiers at Fort Hood, Texas, included several people who shared the same profession as the alleged shooter, a father of three with ties to Laos whose family had a history of military service, a civilian who had returned to work a week after suffering a heart attack, and a psychiatric nurse who arrived at Fort Hood a day before the shooting. Here is a look at the victims.

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Michael Grant Cahill

Cahill, a 62-year-old physician assistant, suffered a heart attack two weeks ago and returned to work at the base as a civilian employee after taking just one week off for recovery, said his daughter Keely Vanacker.

"He survived that. He was getting back on track, and he gets killed by a gunman," Vanacker said, her words bare with shock and disbelief.

Cahill, of Cameron, Texas, helped treat soldiers returning from tours of duty or preparing for deployment. Often, Vanacker said, Cahill would walk young soldiers where they needed to go, just to make sure they got the right treatment.