[Comacoz]

I saw a movie a long time ago, it involves this man that's losing his mind because everytime he looks in the mirror he sees this frightning demonic man in a black cape and a black hat that is reaching out to kill him. But when he turns away from the mirror to see if it's real there's nobody there. Everytime he looks in the mirror he see's the guy. Does anybody know what movie this is? Please help me out thanks