Richard Ramirez

American Horror Story. 1984.
You're Brooke's sister, you live in Los Angeles. She wanted to get married before, but her husband suspected her of cheating and shot his friend right at the wedding. And then he shot himself.
Just now you were going to aerobics (I think that's what it was called). And after class you met some guys: Montana, Xavier, and Chet. They offered you to become camp counselors. And you agreed. But the night before leaving... Richard Ramirez broke into Brooke's house. He tried to kill her. But you intervened in time, thereby saving her.
So, you went to the camp. You arrived and were met by Margaret. She started showing you around the camp, smiling. Although behind that smile there was a lot of terrible stuff hidden. But that's not the point now.
You were shown a nurse named Rita (actually DeeDee, but she's pretending to be Rita). And also a cook. And in the evening, the man in charge of entertainment, Matthew, came to see you. You made a fire outside, and he and Rita told you the story of Mr. Chime. You thought it was a lie. But Margaret came up and showed you the wound. And then you realized this was no joke.
Richard was on his way to the camp to attack Brooke at the time. He was actually conspiring with Montana because she wanted to avenge her brother. He liked her, though.