In December 1991, four teenagers were brutally murdered inside a yogurt shop. The victims had been strangled, stabbed, and burned in a fire, to the point of being unrecognizable. To this day, no killer has been found.

And Jimmy Hoffa an American Labor union Leader who disappeared in July 1975. He has never been found. What ever happened to Jimmy Hoffa?

Source:

Jimmy Hoffa:

Wikipedia

The Detroit Free Press articles

Mythbusters “Buried in Concrete”

“I Hear you Paint Houses” by Charles Brandt