I'M HERE WITH scott McEwen who wrote "american sniper" and with chris's friend, who trained chris to be a snirp. I'm so sorry for your loss. You wrote chris wasn't killed on the battlefield. But you... See More
I'M HERE WITH scott McEwen who wrote "american sniper" and with chris's friend, who trained chris to be a snirp. I'm so sorry for your loss. You wrote chris wasn't killed on the battlefield. But you believe he gave his life to his country. He devote sod much of his life to helping wounded and injured military, individuals returning from war. That was such a big part of who he was. I think chris had a difficult time transitioning from military life to civilian life himself. Think that was a big reason why he care sod much about helping other veterans. The other big issue can ptsd these days. Here's a guy that had, was very successful shortly after he got out of the s.E.A.L. Teams and could have done anything he wanted. He chose to still give a large part of his time to these veterans' causes. In "american sniper" he is quite honest about hisreentry. It was important for him to show there buzz a light at the end of the tunnel. If you look to the light and work to get yourself out of the scenarios you get yourself in, you move yourself and get healthy again. And coming off his time in iraq, just unparalleled, four tour, seven med dallas. More than 150 kills, you helped train chris. Did you know from the start that he was something special? You know, we all knew chris was a special guy. Very humble, to this -- to the time he got out. He didn't really want to publicize the number of kills that -- it was all about the lives he saved in iraq. And helping veterans, raising awareness around the veterans issues. If any possible good can come of this, it's shedding the light on the problems of veterans right now. A lot of guys like chris are taking the issue in their own hands and is making a difference. Guys slip through the cracks. What is the one thing you want everyone to know about your friend? I think chris would want to say a prayer for his children and other children of veterans that need help as well, in similar circumstances. It's what he's found himself in here. We lost a true american hero. And they all are in our prayers today. Thank you both very much.
This transcript has been automatically generated and may not be 100% accurate.