At first, I got this mixed up with another case where the prosecutors were over zealous and refused new DNA tests arbitrarily, and, knowing prosecutors can be real pieces of work, I dug a little:
https://casetext.com/case/partin-v-comm
This is about 450 cases, not one.
The jury at trial considered whether some hair found in the killer’s kitchen trash may or may not have belonged or the victim — apparently, that wasn’t enough to outweigh all the other evidence presented in the case.