Very interesting case Morf, whether it could be Z we can't tell but I found this interesting:
A North Carolina man suspected of driving drunk was arrested while traveling through Latta, S.C. Police say they found a gun that had part of its serial number filed off in the man's car. The gun, believed to have been stolen, was sent to the State Law Enforcement Division (SLED) for examination. SLED experts said the bullets taken from that gun matched those retrieved from the bodies.
''To this day, they still believe that was the murder weapon,' McGehee said.
Authorities said a polygraph test indicated the man was not always truthful during questioning, but they never charged him with the killings. They said they couldn't place him at the scene of the crime.
The man, who has since died, had an alibi: His wife was in a North Carolina hospital, and witnesses told police he was there visiting her. Investigators, wanting to see for themselves if it were possible for the man to sneak away to Sumter County and speed back to the North Carolina hospital, timed the drive.
It would have taken too long, they decided. So they let the one suspect they had go.
I wonder who the witnesses were. Relatives or hospital workers. Even after four months why would they recall that specific day, if he visited a lot at the hospital it would be hard to tell. As far as I can see he was suspected of being drunk (poss drugs) had the murder weapon on his person (filed down number and all) and lied whilst attached to the polygraph. Pass me the handcuffs. He's either the killer or bought the gun from him or one of his associates.
Good call Morf, had never read about this case at all. Very strange that out of two young people neither of them has ever been identified.