As part of my research I have Mater Detective,True Detective and True Crime mags from 1976 and quite often they print statistics such as "I love a mystery" has printed. They can be a great source of information.
Looking at the list, I see Jacqueline Thomas (1961), Anthony Hall was charged with her murder in 2007, albeit it was dropped for legal reasons. Techincally unsolved, but the police have been clear as they legally can that Hall was the killer. Hall thankfully had been in jail since the late 60s for another brutal teen murder. He died, without release, in 2011.