Michah,
Boy, this sounds like it's getting even hairier! Let the cops do their investigation, even if it takes what sounds like forever, it will be worth knowing the truth. Especially for your son-he may not fully understand or is just putting on a brave face for Mum, but there will come a time where he will grieve. Do the good-bye ceremony with him&just be there for him. Stay strong-you're doing way better than I could right now&that's very commendable. It's great that you're so concerned about your son&are there for him-that's the best thing you can do. Hang in there!