There's been a lot of cold case bodies getting dug up for DNA examination. They don't even need the DNA of the murderer to find out who it is. A relative who has done a DNA ancestry check gets them close enough to figure it out. In some of these cases the perpetrator was a suspect when the crime happened, but they lacked evidence. Once they have the DNA the case can proceed.
Thirty three years is no problem. DNA has been sampled from Wooly Mammoths. How long they been dead?
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