There have been several first responders, Police Fire Ambulance workers who have taken their own lives as well, from seeing unspeakable things in their line of work. This is a wide spread issue.
One of my old bosses was a cop who told a story that at the academy they had a mandatory class on how to properly commit suicide.
The reasoning was that the high percentage of first responders seek to take their own lives. Do it right as they would pay survivors benefits, but didn't wish to pay for a vegetable.