Helena Bertinelli is the daughter of late former crime boss Franc Bertielli and the ex-grilfriend of Oliver Queen. She broe up after she realized he was still in love with Laurel.
She tried to kill her father but Oliver intervened and she was killed by her father with her own crossbow.

Biography:
Before the death of her fiancé Michael, Helena tried to turn her father into the FBI. Her father mistook the evidence collected by Helena with her fiancé and had him killed.