Answer
Sasha Pieterse is best-known for her role as Alison DiLaurentis on the television series Pretty Little Liars. The series follows the lives of four high school girls who are tormented by an anonymous figure named "A" who threatens to reveal their secrets. Pieterse's character, Alison, was presumed dead at the beginning of the series but is later revealed to be alive and is the main antagonist of the show.