I have to agree with post #3, women and men have both been seen as committing suicide in very specific ways. As for hanging, I cannot say that one gender over the other has been studied regarding prevalence.
That being said, given the numerous speakers on the subject that I have heard, once a person makes the decision to take their own life, there is not much (if anything) another person can do to deter them.
I am very sorry for your loss. Losing a loved one prematurely is always devastating.