Investigators believe a 17-year-old youth shot and killed golf course worker Richard Hartz in 1963 during a robbery.
But the suspect, whose name is not being released, can't be charged because he died in 2009.
Police say advanced technology showed that matchsticks found on the golf course came from a matchbook in a stolen truck the teen used in a different robbery.
The teen was the leading suspect at the time, but there was no arrest despite an investigation involving hundreds of witnesses and interviews.
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