The Homicide Victims’ Families Rights Act establishes a federal right for cold case victims’ families to request reviews of evidence and updates on case files.
— Read on www.foxnews.com/us/biden-signs-bipartisan-cold-case-law-establishing-federal-right-request-review-victims-families

Not sure how this legislation would work in the OCCK case, but the reasons behind this law certainly resonate.