I started Powerlifting a year ago and two of my lifting partners committed suicide this year. The first, Dakota, was a 22 year-old kid 6 months out of the Army was back in March. The other, Jimmy, was a 35 father of 4 with some life issues including divorce that took his life right after our June meet. Jimmy and I squatted together an hour and a half prior to his suicide-I didn't have a clue he was hurting that much (although there were some contributing factors that he did in between). I couldn't lift for 6 weeks after that and I still miss lifting with him from time to time.
The silver lining in all of this is that our little group got a lot tighter and it has opened up some lines of communication that have helped others dealing with these types of issues.