Blue eyes and dark skin?

Blue eyes and dark skin would seem to have opposite geographies: blue eyes are found in mostly northern latitudes and dark skin is a tropical trait found in people around the equator. They say blue eyes lack the brown filter in front so as to allow more sun to enter the eyes in northern regions where sunlight is scarce. Meanwhile, dark skin handles high amounts of sun well and actually requires lots of sun to make vitamin D. 

So this new discovery poses the question why would an ancient hunter have blue eyes and dark skin in Spain 7000 years ago?

DNA shows ancient hunter had blue eyes, dark skin

http://www.washingtonpost.com/world/europe/dna-shows-ancient-hunter-had-blue-eyes-dark-skin/2014/01/28/59aebbe4-8812-11e3-a760-a86415d0944d_story.html?hpid=z2

also

Genetic Mutation Makes Those Brown Eyes Blue
http://www.nbcnews.com/id/22934464/#.Uugwh7_0BT4