What serial killer wore a Mask?

Could you elaborate on the enigmatic figure of the masked serial killer? What are the key details surrounding this mysterious perpetrator? Did he target specific victims or was his choice seemingly random? Was there any particular pattern in his crimes, such as a signature move or method of operation? Did authorities ever have a promising lead or potential suspect who fit the description of this masked murderer? Did his identity remain a mystery to this day, or was there a surprising revelation that shocked the public? Understanding the specifics of this case could potentially provide insight into the psychology and motivation of serial killers.