What controversy? King Tutankhamun was North African, and while not "black" per se, he as he was depicted in the art of his time dark skinned (although there are arguements as to how dark skinned) to say the least... all it takes is a little research into the past - or even a look at the record in Egyptian art from the period...
Some reconstructions:
British reconstruction
French reconstruction
Bust from his tomb
Image from tomb wall showing Nut (goddess of heaven and sky) greeting Tutankhamun