April 4: BTK's only known survivor fights back

Plus: the Hinterkaifeck murders, law professor stabbed to death, and more.

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1922: The Hinterkaifeck murders are discovered

It’s been called “Germany’s coldest case.”

On a lonely farm an hour from Munich, six battered bodies were discovered on this day in 1922. All had been smashed to death by a mattock, a farm tool similar to a pickaxe.