It was Wun Wun. He was fatally shot in his left eye by Ramsey Bolton after he broke through the gate of Winterfell at the end of Battle of the Bastards.

Pretty sure the “bleeding star” in the “Prince who was promised” prophecy is Arthur Dayne himself. Their sigil is the falling star, he was stabbed and bled to death at the Tower of Joy during Jon’s birth. Seems pretty straightforward, no?