Master Sgt. Mark Allen, 46, of Loganville, Georgia, died Saturday, the Atlanta Journal-Constitution reported. His obituary said he died from complications of an injury sustained while serving in Afghanistan.
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Allen was shot during an insurgent ambush in 2009, and was left unable to speak and paralyzed over much of his body. An official cause of death wasn't released.
Allen spent 21 years in the Army and the Army National Guard. He retired upon receiving a Purple Heart in 2013.
After his unexpected release in 2014, Bergdahl was spared prison time for abandoning his post and endangering military comrades who participated in the lengthy search for him.
Allen was seriously injured in the search for Bergdahl. Allen's wife, Shannon Allen, gave a heart-wrenching testimony nearly two years ago during Bergdahl's sentencing hearing about her husband's state.
"He's lost me as a wife, essentially, because instead of being his wife, I'm his caregiver," Shannon Allen told a military court. "I mean, we can't hold hands anymore, unless I pry open his hand and place mine in it."
Sharon Allen said that her husband was "always happy-go-lucky" before he was wounded. They had a son, Cody, and a daughter, Journey.