Hey /x/, let's take a break from the earthquake crap/usual shitposting and actually have a thread about something truly /x/-related:
Let's have a thread about creepy crimes and mysteries that remain unsolved to this day.

For the record, let's avoid he Dyatlov Pass Incident.
Every time it gets mentioned it derails the thread with pointless debate.
But aside from that, any crimes with creepy circumstances or a still unsolved status are fine.

Bonus points if you include a summary in your post instead of JUST a Wikipedia-link.

I'll start us off with a classic.

http://en.wikipedia.org/wiki/Glico_Morinaga_case

http://en.wikipedia.org/wiki/The_Monster_with_21_Faces

>In 1984, masked thugs take the President of a wealthy Japanese candy company hostage after breaking into his and his mother's houses.
>Hold him captive in a warehouse and demand 1 billion yen and 100 kilograms in gold bullion for his return.
>President manages to escape but has no idea who his captors are.

>Unknown assailants light cars on fire at the company's parking lot and leave threatening messages with containers of acid

>Company receives letters claiming that their candy products have been contaminated with potassium cyanide from a person/group that signs the letters as "The Monster with 21 Faces"
>Company pulls products from shelves and finds no poisoned products. In total the prank cost them 21 million dollars.

>Police pursue a suspect at a money-drop in exchange for ceasing harassment, but lose the perp. Officers identify him as the "Fox-Eyed Man".
>He escapes capture at a second money-drop, abandoning his car which they find had a radio transceiver for eavesdropping on police.
>Police Superintendent in charge of the case later commits suicide by pouring gasoline on himself and lighting himself on fire.

>More taunting letters, and then the person/group is never heard from again.