Moaning Myrtle

Shirley Henderson portrayed Moaning Myrtle, the creepy and weepy ghost who haunted the restrooms in Hogwarts. Tom Riddle ordered the Serpent of Slytherin to kill her and she has been haunting Hogwarts ever since.

Source: Zen Herald

Shirley Henderson has been busy after the Harry Potter franchise. She has appeared in a lot of TV shows and short films. Shirley is also the voice of Babu Frik in Start Wars: Episode IX – The Rise of Skywalker.