The 1978 cold case murder of Silicon Valley high school teacher Diane Peterson, who was stabbed to death, has finally been solved.

Branham High School teacher Diane Peterson was stabbed to death by a 16-year-old boy, Harry “Nicky” Nickerson, on June 16, 1978, the Santa Clara County District Attorney’s Office said.

Decades after Diane Peterson’s 1978 killing at Branham High in San Jose, the suspect, Harry Nickerson, has been identified, Santa Clara County prosecutors say.

Diane Peterson, a teacher at Branham High School in San Jose, was stabbed to death by 16-year-old Harry “Nicky” Nickerson on June 16, 1978, the Santa Clara County District Attorney’s Office ...

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.

Diane Peterson, a teacher at Branham High School in San Jose, was stabbed to death by 16-year-old Harry “Nicky” Nickerson on June 16, 1978, the Santa Clara County District Attorney’s Office ...

Diane Peterson was found dead on a hallway floor near her classroom at a San Jose high school on June 16, 1978, according to the Santa Clara County District Attorney's Office. She was 26.

Decades after Diane Peterson’s 1978 killing at Branham High in San Jose, the suspect, Harry Nickerson, has been identified, Santa Clara County prosecutors say.

Diane Peterson, a teacher at Branham High School in San Jose, was stabbed to death by 16-year-old Harry “Nicky” Nickerson on June 16, 1978, the Santa Clara County District Attorney’s Office ...