The chances are pretty slim that anyone involved in that killing is still alive. Even if one or two are alive, the chances of any witnesses being alive and available are even slimmer. It's extremely doubtful that any forensic evidence still exists, so the prosecution of any accused murderer would depend almost solely on eyewitnesses and circumstantial evidence.
I'm not saying this or any other unsolved murder case should be closed and forgotten, but I think this media hyped re-enactment is designed more to draw publicity (and political advantage) to the participants than to re-opening the investigation.