Lirath Windrunner was the youngest brother of the Windrunner siblings. He dreamed of becoming a ranger like his three sisters.
Lirath was killed when a group of orcs cut their way into Quel'Thalas and attacked the Windrunner clan. Several uncles, aunts, and cousins also perished.
Lirath's oldest sister, Alleria Windrunner, swore revenge and began hunting down all remaining orcs after the end of the second war. (BtDP 68)