My DH has just asked would it not be better if the family did not find out it could have been murder? Thinking about it, finding out one's daughter had been murdered rather than had died from unknown, possibly natural, causes, could be very disturbing.
I think I'd want answers if I was in their shoes, I have an Uncle who died age 41 of unknown causes, it still upsets my Nan that she doesnt know what happened and why he died.