ALL parties are now dead??? Yeah definitely a murder. Even before I read that, no one kills themselves if they are recently engaged! Married, maybe & single maybe but never engaged because they are not alone & not locked in either. Unless it was some other reason, but if so he would have talked to you about it. Yes, it was murder

I'm terribly sorry. That must be hard. All those years & no clear answer. My heart goes out to you { <3 }