From: www.cnn.com

Fort Hood, Texas (CNN) -- Thirteen people died after a shooting spree Thursday at Fort Hood, a sprawling Army post in Texas.

Michael Cahill, 62, liked his job as a physician's assistant at Fort Hood so much that he only took one week of recovery time after undergoing heart surgery, his sister told CNN affiliate KREM.

Cahill, who served in the Army Reserve, previously worked as a registered nurse, Marilyn Attebery told KREM. He later returned to school to pursue a career as a physician's assistant, she said. Cahill was assisting with physicals for soldiers preparing for deployment at the time of the shooting, his sister said.

"I'm just upset for all the families and for what went on here. They're talking about wars and show wars and it's right there in Fort Hood and it's just devastating to everybody and all the families," Attebery told KREM.

Hunt, 22, wanted to be part of something greater than himself, his sister Leila Willingham told CNN. He enlisted in the Army in 2006 and spent his 21st birthday in Iraq, she said. He chose to re-enlist, dedicating the next six years to the military.