(SAN JOSE, Calif.) — The brutal murder of a school teacher, stabbed in the chest at a California high school in 1978, has finally been solved, according to authorities, with the district attorney’s office now revealing the then-16-year-old killer confessed to a family member minutes after the murder.

Diane Peterson was found stabbed at Branham High School in San Jose one day after school ended for the summer. And though they had suspects over the years, her murder had never been solved.

One of those suspects, Harry “Nicky” Nickerson, has now been confirmed as the killer, the Santa Clara County District Attorney’s Office announced Monday.

Earlier this year, investigators learned Nickerson had confessed to a family member he committed the murder. Investigators met with the family member,

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