In 1986, Lillian was hunting a malevolent banshee and tracked it to the Leahy family's house. She only found Eileen Leahy alive, but the infant girl was rendered deaf by the banshee. She later raised and trained Eileen to be a hunter, including teaching her a spell that could trap someone in its vicinity.
Lillian died from cancer when Eileen was sixteen. Eileen kept Lillian's hunter's journal and used it to aid her in her quest for revenge.