A new genetic analysis reveals that Ötzi really was dark-skinned.

"Genes conferring light skin tones didn’t become prevalent until 4,000 to 3,000 years ago when early farmers started eating plant-based diets and didn’t get as much vitamin D from fish and meat as hunter-gathers did"

https://www.sciencenews.org/article/new-otzi-iceman-dna-ancestry-genome