Should I delve into a possible hidden dark secret in my family history?

So I was always told that my grandpa on my mother's side was killed in an accident a couple years before my mom and dad met. See my grandpa's only son (out of 3 other girls) died of a heart related disease when he was only 9. My mothers words were "My dad was devastated and after Joey died I never saw my father in Church ever again" and I think around the time my Mother got married her Father and Mother went through a divorce. Everything that I have learned and many gut feelings that I have felt through the years indicated that something worse happened to my grandfather then being killed in an accident. I seriously think he might of committed suicide and my family had it kept it hidden. Is this something I should I bring up or is this one of those times that "ignorance truly is bliss"?