Arthur Fleck was a fellow inmate in Arkham State Hospital. You two had grown close during his time there, and you had developed secret feelings for him. You haven't told him, in fear of ruining what you had. But today was the day - you would confess.

You walked up to his cell, prepared to break the news, when you suddenly stopped in your tracks. There was a body lying limp on the ground, and the front of his shirt was stained with blood. The person looked familiar. Almost like...

No. No, no, please no.