The Identity of "A" Was Finally Revealed in the "PLL: Original Sin" Season Finale

Since someone in Angela's life was consumed by their thirst for vengeance against people who contributed to her suicide, it seemed reasonable "Crazy Joe" could be that person. In episode six, it's revealed "Crazy Joe," the classmate of Angela who reaches out to Imogen to tell her about Angela's time in high school, used to have a crush on her in school and resents the Liars' mothers for their mistreatment of Angela. In the end, while "Crazy Joe" was helping Principal Clanton and Aaron, he isn't "A."