OK. I read your post more. somehow you have grabbed both the skull and bones from both upper & lower body part and are not able to grab DNA and complete evidence. This is crazy to me. If you are forensics certified, every single 'bone' should have DNA, that DNA should match the body what ever, it SHOULD be part of one CharID, but coding this sounds complex.
I guess one very smart thing you could do is investigate now, grab all details, and solve the cold case a couple years later. It's 1990 and one day the server might just say 2025 Mafia Roleplay.
Peace homie Im about to do some VERY annoying legal civillian RP. with a camera