Pretty Little Liars: Ian Thomas
When: Season 1, Episode 22, “For Whom the Bell Tolls”
How: A mysterious figure in black shoves creepy Ian (Ryan Merriman) off a bell tower as he’s chasing Spencer (Troian Bellisario) — causing him to die by hanging. Ian’s body disappears, only to later turn up in a barn. Still dead. Ian may have killed Alison (Sasha Pieterse), but he won’t be the one to set the record straight.