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Jury Convicts Mark Personette in 1978 San Francisco Killing of 15-Year-Old Marissa Harvey

Investigative genealogy plus DNA from discarded hygiene items linked the 80-year-old to material recovered from the teen’s clothing as well as gum.

Overview

  • A San Francisco jury on Thursday found Personette guilty of first-degree murder in the 1978 slaying of Marissa Harvey, who was visiting from New York.
  • The cold case was revived in 2020 and, in 2021, investigative genealogy identified Personette as a suspect for FBI surveillance.
  • Agents collected his DNA from personal hygiene items he threw away in a Denver-area Walmart parking lot, enabling a targeted comparison.
  • Laboratory testing matched his DNA to material on Harvey’s sweater, jeans and a piece of dried gum recovered at the scene.
  • Investigators later found 1970s San Francisco maps and California license plates at his home; sentencing is set for Dec. 17, with a potential life term.