Who is the murderer Mickey in "Scream 2"? Did he appear in 1?

Mickey is a reporter who is actually Billy's mother, Debbie Sauter. Both are murderers and both appeared in "Scream 1".

At the end of the story, Randy explained to everyone the three taboos of horror movies - no going to bed, no smoking and drinking, and no saying "I'll be back soon", but then a phone call came telling Lan After hearing the news that Principal Dee had been assassinated, most of the party drove to the school to find out what happened, leaving Randy, Stu, Sydney and Billy behind;

Bill was resting upstairs. Leigh was assassinated by the murderer. After being seen by Sydney, Sydney started fighting with the murderer again. Kenny, Gale's photographer who wanted to help, had his throat cut to protect Sydney and died. At this time, Dewey and Gale, who were walking outside, discovered Sydney's father's empty car in the woods. They suspected that the murderer was Sydney's father. They had a premonition that something was wrong. When they returned to Stu's house, they found that the remaining four people had disappeared. . After escaping, Sydney returned to Stu's home, only to find that the murderer was actually Billy who had faked his death. Stu was Billy's accomplice, and Randy, who had already guessed the murderer, also Shot down by Billy. Billy told Sydney that his motive for killing was because Sydney's mother broke up his family, and Stu just thought killing was fun; and told her that Sydney's father was tied up in the basement by Stu. After some entanglement, Sydney used a vase to end Stu's life. Gale, who arrived, picked up a gun and killed Billy after Dewey was stabbed, and sent the injured Dewey, Randy and Sydney's father to the hospital. , a nightmare is finally over.

Extended information:

"Scream 2" plot summary——

The bloody storm strikes Windsor College again! A student couple was killed in public by a masked murderer while watching a horror movie. The audience thought it was a joke caused by the movie and no one stopped them. On the other hand, Sydney is now a well-known figure in the town of Kurtz. After Caton Vere was acquitted in Weigel's new book, the media and police once again focused their attention on On Sydney. At the same time, the masked killer went on a killing spree again, and mysterious phone calls continued to haunt Sydney and the people around her. ?For a time, everyone once again fell into panic about the unknown murderer, and Sydney's boyfriend Derek seemed quite consistent with the clues that exposed the murderer. After all, who is the real identity of the masked murderer? Wei Geer, Randy and other friends or related persons of Sydney were involved in this adventure of chasing the murderer.