He was genetically predisposed to male-pattern baldness.

And given that he died in his mid-40s — an age at which male-pattern baldness often manifests significantly in men with this genetic predisposition — it is quite possible, perhaps even likely, that Ötzi was bald or substantially bald when he died.

This finding has an interesting relationship to the physical evidence.

The mummy does carry some hair — fragments of dark hair were found with and on the body.

But this hair is sparse, and its condition has been attributed to various processes including the trauma of recovery and the effects of freeze-thaw cycles over thousands of years.