In 1990s Lisbon, Portugal, police were baffled when three sex workers all called Maria were killed with the same brutal pattern - and the killer was never caught

In the '90s, a mystery emerged in Lisbon after 22-year-old Maria Valentina was found lying in a pool of her own blood behind a shed. She had been strangled , disembowelled and was missing her heart, liver, intestines and genitalia.

The police launched inquiries, stating they had never witnessed a victim who had been left in such a condition "in over 30 years". Officers identified her as a sex worker who was known for battling drug addiction, but could not uncover any evidence that would lead to the culprit.

Roughly six months later, 24 year old Maria Fernanda was also discovered behind a shed, in identical circumstances a

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