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Mark Personette, 80, Convicted in 1978 San Francisco Murder of Visiting Teen

Modern DNA testing and investigative genealogy revived the cold case, tying him to clothing and a piece of gum.

Overview

  • Jurors found Personette guilty of first-degree murder in the killing of 15-year-old Marissa Rolf Harvey, who disappeared on March 27, 1978 after going to Golden Gate Park.
  • Harvey’s body was discovered the next day in Sutro Heights Park, and an autopsy determined she had been sexually assaulted and strangled.
  • Investigative genetic genealogy identified Personette in 2021, prompting FBI surveillance that collected his DNA from discarded personal hygiene items in a Walmart parking lot near Denver.
  • A subsequent test matched Personette’s DNA to Harvey’s sweater, jeans, and a piece of dried gum, and a search found 1970s San Francisco maps and 1979 California plates despite his denial he had been in the city.
  • A woman testified that Personette raped her in New Jersey in 1979, and he now awaits a Dec. 17 sentencing, facing seven years to life in prison while remaining in custody.