Mademoiselle Payet

Mademoiselle Payet is Julie's nosy neighbor. She is a single middle-aged woman who has an unusual interest in Julie's life. She often looks through her door to see if Julie is walking out of her apartment.

History
Mademoiselle Payet does not know Simon or Adèle, so she probably moved into the building after Julie.

Season 1
In the first episode, Mademoiselle Payet sees a recently returned Simon knocking on the door of Adele's old apartment and believes that he is Julie's lover. She later asks Julie if "Adèle Werther" is her dating name.

Mademoiselle Payet tries to get Victor to leave Julie since she does not believe that he is related to her. She is found dead in her home, stabbed multiple times. Her death is ruled a suicide.

Death
Although her injuries seemed to have been self inflicted, Victor is likely to be involved in her death. He visited her the day that she died and later drew an image of her body being eaten by her cats. Based on his involvement in Toni's suicide, Payet's death may have been caused by similar hallucinations caused by Victor.