Anne Brontë

Anne Brontë (pen name Acton Bell) is the youngest of the talented Brontë siblings, tertiary antagonist and author of the famous novel ''"The Tenant of Wildfell Hall". ''

Murders
Anne Brontë was responsible for the murders of:

In the series
"'Ghosts, let me introduce myself: I'm Anne Brontë. So sorry I'm late for dinner...'"

Chapter 10
At the end of Chapter 10, Anne appears with a knife.

Chapter 11
Anne confesses all her murders and tries to murder Oscar. In the end, she is brought to prison.

Trivia

 * According to her: Snitches get stitches
 * The story takes place in 1849, the real Anne Brontë died in the same year.
 * This could indicate she dies shortly after the last episode.