My condolences on your loss diesel94. I lost a cousin some yrs back to suicide. In his case he'd been in the Gulf War conflict back in the 90's and from what others in the family have said it changed him. Loss is never easy.
I did find the following books through Amazon. Perhaps you may find one or more of them helpful.
http://www.amazon.com/When-God-Steps...4222523&sr=1-4
http://www.amazon.com/Reflections-Su...4222523&sr=1-2
http://www.amazon.com/s/ref=nb_sb_no...uicide&x=0&y=0