The trial you alluded to is the trial of Michael Skakel, a Kennedy cousin. I had the opportunity to read the book about it. There was an investigation into the case by Skakel's father who was trying to clear the name of his older son who had at first been accused of the crime. So there is much physical evidence, and documents from the 60s about the case that have survived.
More importantly, some memories never go away. It depends on the circumstances, especially if you have never gotten closure.
Although one may not have a clear recollection of what someone was wearing, or exactly how tall they were. Some memories never go away.
There is not statute of limitations on murder, (if the Klan case was a murder) and cold cases are dug up and solved everyday. If justice prevails, it shouldn't matter how long it took.
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