BOZEMAN, Mont. -

Matt Christiansen doesn't know if he'll ever sit in this chair again. It was his brother's chair and the last place he saw him alive.

"I went to bed at 11:30 and everything seemed normal. Although, I was aware that the circumstances were such that he might get into a bad place. Just before 2am so, less than two hours later, he was gone," says Matt.

Christiansen had helped his brother Wade through those bad places before. But for Wade, pain was a daily battle. He used prescription medication to help control it, but Wade struggled.

"It's a permanent cycle, right? I'm going to be on medication and be in chronic pain for the rest of my life," explains Matt.

Matt tells me his brother's pain stemmed from an injury Wade suffered while on patrol in Afghanistan in 2010. A half a dozen IEDs exploded, killing two of his team and wounding Christiansen.

"That just shattered his jaw, basically, into a lot of pieces," says Matt.

Several years later, Wade Christiansen was out of the military and studying photography at Montana State University. Six months ago, Matt moved into Wade's new home in Four Corners.

"I was really confident that this was going to be a really good situation for both of us and he would have every form of support that he would need, which he did," says Matt.

Wade had a new home, friends and family who supported him and the medical care he needed.

"I was broken because I thought it's such a shame that someone in his position would take his own life but now I realize there's nothing anybody could have done better because he had everything," explains Matt.

Matt tells me, his brother's death was the result of intense pain few folks ever endure.

"The pain was a product of his choice and who he was and was the product of the adventures he sought. He would never take that choice back in a million years," says Matt.

Now, Matt still learns from his brother and takes solace in the last six months they spent together.

"Do what it is that you need to do and be the person you are," says Matt. "He only had 23 years but they were a jam-packed 23 years and he really fit a lot of life into them," he says.

Christiansen tells me they are directing family and friends to Operation Second chance, a charity that organizes retreats for service members recovering at military hospitals.

He says the charity played an important role in his brother's recovery.

For more information, you can visit their website.