Authorities say a suspected serial killer has been linked to the death of a New Jersey high school student whose naked, battered body was found alongside a highway 50 years ago.

State police and Monmouth County prosecutors announced their findings Wednesday.

They say a new analysis of evidence links Robert Zarinsky to the 1965 death of 18-year-old Mary Agnes Klinsky. An autopsy determined the Raritan High School senior had been sexually assaulted and died from skull fractures caused by significant blunt-force trauma.

Zarinsky was serving life for another teenage girl's killing when he died in prison in November 2008. He was about to stand trial for the 1968 murder of a 13-year-old girl.

Prosecutors say DNA evidence excluded everyone but Zarinsky as a suspect in the Klinsky killing.