Who really killed Charlotte on Pretty Little Liars? 1 / 9
The premise of the show has a group of teen girls threatened by a vengeful stalker dubbed "A." 2 / 9
The series lasted seven seasons and earned a short-lived spinoff called The Perfectionists. 3 / 9
The Liars' bullying victim Mona was later revealed to be "A." 4 / 9
Charlotte DiLaurentis - Alison's cousin - was revealed to be Mona's successor Big "A." 5 / 9
She is later exposed and sent to a psychiatric hospital for five years. 6 / 9
Mona is soon found dead after she's released in an apparent suicide. 7 / 9
It's later revealed Mona killed her in self-defence and Charlotte had planned a new wave of torment for the Liars. 8 / 9
While Mona being the killer wasn't a huge shock, Charlotte's evil plot was a surprise. 9 / 9