Season 5. The Liars discover that the hooded figure in the season four finale was Shana, who dies when Aria pushes her off the stage of the Fitzgerald Theater.

Does Shanna die in PLL?

She dies from head trauma. Shana is seen in Aria's nightmare through a series of flashbacks, that include her toting a gun in New York, at Rosewood High, with Jenna, and playing the violin at the Brew.

Who died in PLL Season 3 Episode 13?

It is not a flashback like "The First Secret" in Season 2, but there are some flashback scenes. Troian Bellisario revealed that it is a "standalone episode." Garrett Reynolds is killed by Darren Wilden.