I'm not aware of any studies. Corrections would have more information with regard to that. However, on a personal note, I know of individuals who have, after traumatic incidents, unfortunately, taken their own lives. It's something we have to live with every day. You go through a stressful situation where you see people die or seriously injured, and often it's difficult to absorb and deal with.
On May 17th, 2016. See this statement in context.