Key Murders in Pretty Little Liars
The series features multiple murders tied to secrets from Rosewood's past. The most central killing is the death of Alison DiLaurentis, whose disappearance drove the early plot. Other major victims include Mona Vanderwaal, who was killed by a masked figure in the dollhouse, and Detective Darren Wilden, whose death sparked the "A-Team" escalation.
Who Killed Alison DiLaurentis
Alison's murder is resolved in the series finale. The killer is revealed to be Mona Vanderwaal, who acted while under the influence of Charles DiLaurentis, later known as "A.D." Mona buried Alison alive after a confrontation, but Alison survived and was later killed again by "A.D." in the show's final season.
Other Major Killers and Victims
Charlotte DiLaurentis, the original "A," killed multiple people, including her own father and several others connected to the Radley Sanitarium. Archer Dunhill, Alison's fraudulent husband, was murdered by "A.D." as part of a cover-up. For a full list of deaths and suspects, see the detailed Pretty Little Liars wiki.
