Beth Hunter

Beth Hunter (Code named Reaper) was the younger sister of Jake Hunter and had her mind wiped by a hero called Psych (who was forced into it by Chameleon) to make her forget that she had a brother and she was then hired by the HERO Foundation to try and kill Jake's alter ego the Dark Hunter.

Death
Beth Hunter was Killed along with Eric Kirby in the Battle of Egypt, when the head of the Sphinx was knocked from the statue and crushed the pair to death. The event led to Jake becoming motivated to find the missing pieces of the Life and Death Core Power Crystal, in an attempt to bring her back to life.

Trivia

 * Beth was the only member of her family to not have the mind wipe removed.
 * Despite this, Beth was informed of the truth by Chameleon just prior to her death.