An 80-year-old man was convicted Thursday in the decades-old murder of a teenager who was found dead in a San Francisco park.

A jury found Mark Stanley Personette guilty of first-degree murder in the 1978 killing of Marissa Harvey, 15, the San Francisco District Attorney’s office said in a news release.

“At long last, justice has been delivered, and Mr. Personette is being held accountable for this horrific crime,” District Attorney Brooke Jenkins said in a statement.

Personette’s lawyer, Adam Gasner, said in a statement Thursday that he maintains that there was reasonable doubt in the case but respects the jury's verdict.

"The jurors were extremely attentive and were following often dense and complicated forensic evidence," he said.

Harvey had been visiting her sister in San Franci

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