Father Joe, I don't understand ?

Father Joe,
What could possibly make a young man the age of 24 blow his brains out with a shot gun in his own back yard ? I've worked with this young man's mother and Grandmother for some 20 years. I've known him since he was a kid. He was funny and witty and full of life. His suicide came out of know where. No Note, no apparent life problems..... Why then? He had a girlfriend and goals. he left his family totally devastated.
I came home from work today after finding out this dreadful news and held my daughter my only child and cried. She is alive and full of life and a future, I could not bare the thought of losing her. I told her that no matter what happens in her life , she can come to me and talk. With daughters I think it is easier for them to talk about their fears and problems. Son's are more apt to hold back because of being afraid of being weak.
I am truely sad for this family........................