In terms of serial killers you’ve “never heard of,” this case may be the one. 

Dismembered body parts, hacked apart with saws, began appearing in Hanover, Germany during the 1970s. First, a torso, followed by a leg, and then arms and a thorax! The atrocities only kept coming.

This “human puzzle” has confused investigators for nearly half a century.

Sources:

Breen, K. (n.d.). 3 charged in connection with One direction star Liam Payne’s death in Argentina. CBS News. https://www.cbsnews.com/news/liam-payne-death-charges-argentina/

R/unresolvedmysteries - the saw-killer of Hannover killed six people in the 1970s and left their body parts in public places - all victims are unidentified and there are no suspects. (n.d.). https://www.reddit.com/r/UnresolvedMysteries/comments/j4ii4a/the_sawkiller_of_hannover_killed_six_people_in/

Wikimedia Foundation. (2024, April 15). Saw-killer of Hanover. Wikipedia. https://en.wikipedia.org/wiki/Saw-Killer_of_Hanover

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