Annabel initially appeared devastated by Edgar's death, claiming her relationship with Edgar was idyllic and that he dedicated all of his poetry to his love for her. She continued to argue the same when the player and Isaac Bontemps discovered a poem of Edgar's that detailed him breaking Annabel's heart, claiming that Edgar saw her as "his muse for every shade of love".
But ultimately, Annabel's meek demeanor was revealed as a mask for her true personality as a vengeful villainess. Sometime prior to the case's events, Annabel discovered love letters Edgar was writing for other women, revealing her boyfriend had been a serial adulterer for years. Enraged at her lover's treachery, the evil Annabel killed Edgar after finding him passed out drunk in the cemetery, poking holes in his neck with a syringe before using a pump to drain the blood out of his body, wanting to set his death up to look like a vampire attack.
Annabel left strands of her hair on the pump, with this being among the evidence proving her as Edgar's killer. When confronted, Annabel initially continued to feign innocence before angrily admitting to the truth, proclaiming that Edgar deserved to die for cheating on her and stating that draining her lover's blood felt satisfying to her. Annabel was arrested and sentenced by Judge Justin Lawson to life imprisonment, much to the villainess' dismay. Annabel later told the player and Maddie O'Malley from within prison that she had been given the idea of staging Edgar's death as a a vampire attack by "The Devil", a mysterious figure in Grim Chapel who was assisting people in staging supernaturally influenced crimes, having been provided the blood pump by the anonymous figure.
- (Isaac: "Confess, Annabel! Why did you kill the man who loved you, who saw you as his muse?") His muse? Me and every other woman in town! If that scoundrel didn't want to get killed, he shouldn't have played around!" (Annabel's confession to murdering her boyfriend, Edgar Woe)
- "I wasted my best years on Edgar! I turned down perfectly good marriage proposals! And all I got in return was a drunkard and a cheat! Well, tonight, I finally had enough! I found him so drunk he didn't even feel the prick of my needle in his neck! Watching his blood draining into the jar was curiously satisfying! He'd broken my spirit - so I took his blood!" (Annabel's rant agains Edgar's infidelities, revealing her motivation for killing him)