This case contains information which may be upsetting - viewer discretion is advised.

'Fred the Head' is the informal name given to an unidentified body found on a small island in the middle of the River Trent in 1971. His killer has never been caught - because where do you start looking when you can't identify the victim?

Undiscovered started life as a website, which you can check out at https://www.undiscoveredtruecrime.co.uk/ (information about sources used for each case, and credit for images can also be viewed here).

Music is titled 'Horror Playhouse' and is courtesy of Purple Planet.

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