A close-up of the cloth taken from a sofa in Adolf Hitler's bunker, where the German dictator killed himself in 1945. Blink Films

Researchers have analyzed a sample of DNA believed to belong to Adolf Hitler, which they say reveals the dictator of Nazi Germany had a genetic marker for a rare disorder that can delay puberty, according to a new documentary.

The research, which took more than four years to complete, was led by geneticist Turi King, a professor at the UK’s University of Bath who is known for identifying the remains of King Richard III . King said she verified that a piece of material taken from a couch in the bunker where Hitler shot himself in 1945 was soaked in the dictator’s blood by comparing a DNA sample recovered from the blood with a confirmed relative of Hitler’s.

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