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The 'Friday The 13th' Copycat Killer

On October 24, 1988, in Greenfield, MA, Mark Branch actualized the urban legend of a small-town killer inspired by horror movies. Dressed as Jason from the Friday the 13th film series, he brutally killed Sharon Gregory. Police and the media quickly blamed the tragedy on Branch’s obsession with horror movies.

While Branch did own a substantial slasher flick collection, it’s impossible to determine why he chose to kill on that October night. Locals reacted similarly to how their counterparts would in a horror film. There was no discussion about a deeper motive behind the young woman's slaying; instead, the public picked a scapegoat and never looked back.

Amateur sleuths feel fascinated by this story, especially since it resembles a suicide/killing myth that only grows with time. These Friday the 13th Copycat Killer facts attempt to shed light on the case, but you may find the answers don’t come easily.

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  • Sharon Gregory's Twin Discovered Her Sister's Body
    Photo: davidpinter / Wikimedia Commons / CC BY 3.0

    Sharon Gregory's Twin Discovered Her Sister's Body

    No one knows the details of what happened when Mark Branch entered Sharon Gregory's house, but the aftermath provided horrific context clues. Gregory's identical twin Cheryl reportedly found her sister's body in the bathtub. Sharon had multiple gashes in her head, chest, and abdomen.

  • Mark Branch Had An Obsession With Horror Movies

    During the manhunt for Mark Branch, numerous reports recycled the same information about the alleged killer. Police believed he suffered a psychotic break and became mixed up in a fantasy world. One investigator said Branch "thinks he's Jason," the hockey mask-wearing antagonist of the Friday the 13th films. 

    At the time of the slaying, Branch was working in a grocery store and renting horror movies whenever he could. In a later interview, a Video Expo 1 associate in Greenfield said, "[Branch] rented strictly gore, period. The gorier, the better.”

    When police searched Branch's apartment, they found a veritable monument to horror. They reportedly recovered 75 slasher films, 64 killer-related books, three knives, a machete, and three goalie masks. 

  • A College Paper Might Have Set Off Mark Branch

    Perhaps the biggest mystery surrounding Sharon Gregory's slaying was why Mark Branch did something so vicious to a person he barely knew. The consensus involves Gregory, a student at Greenfield Community College, writing a Psychology 101 paper on Branch's horror film obsession. It didn't sit well with Branch.

    In an odd twist, police have never found the essay. It's possible Gregory simply told Branch she wrote it.

    Greenfield Police Chief David McCarthy later said, "Sharon Gregory had in her possession a psychological profile of Mark Branch, and that profile was wanted badly by Mark Branch. He didn't like her having it, and he wanted it." 

  • Mark Branch Allegedly Took His Own Life
    Photo: Xelcise / flickr / CC-BY-NC-ND 2.0

    Mark Branch Allegedly Took His Own Life

    After an exhaustive manhunt and a series of sightings of the alleged killer appearing across New England, the public ultimately found Mark Branch hanging from a tree in rural Buckland, MA, on November 28, 1988. The New York Times reported hunters discovered Branch's body during the first week of deer season. Police "tentatively" ruled the death a suicide, but the lack of follow-up reports about the exact cause of death added fuel to the fire of urban legends still surrounding Branch.

  • Greenfield Was On Lockdown After Sharon Gregory's Death

    The timing of Sharon Gregory's death was inconvenient - to say the least - for the Greenfield police. October 24 was a Monday, which meant Halloween celebrations were happening throughout the weekend and likely into the next week.

    The police didn't only have to deal with the usual pranksters causing trouble - now they had a killer on their hands. The police effectively shut down Halloween in Greenfield. They moved trick-or-treating to the middle of the day and canceled the Halloween parade; the local theater changed its plans to premiere Halloween IV: The Return of Michael Myers.

    The police worried about Mark Branch returning and enacting a sequel to his first slaying; they also wanted to make sure there were no copycats. Authorities believed if anyone went out on Halloween dressed as Jason, the costume would elicit more fear in the locals, which might have caused a riot.

  • Police Were Onto Mark Branch Immediately
    Photo: sometimes drywall / flickr / CC-BY-NC-ND 2.0

    Police Were Onto Mark Branch Immediately

    The police were suspicious of Mark Branch as soon as they uncovered the victim's body, and they immediately launched a full-scale manhunt. It's unclear why the police initially singled out Branch as the killer - perhaps they had a tip when Branch disappeared - but once the authorities decided he was their man, they didn't have a second thought. After someone reported Branch's car at the edge of the woods, police combed the forest, but to no avail.