We fully expect a number of handwritten letters regarding this post.

The Chronicle’s front page from July 14, 1978, covers a probe into a prominent San Francisco detective who worked on the Zodiac case years after the notorious killings.

“Police officials are investigating the possibility that Inspector David Toschi forged a Zodiac letter to The Chronicle in 1974 as well as a similar letter the newspaper received earlier this year,” the front-page story by Mike Weiss read.

“Acting on a complaint and request for such as investigation from writer Armistead Maupin and public relations consultant Kenneth Maley, internal affairs bureau officers are having Toschi’s writing and printing compared with both letters.”

Toschi became forever linked to the Zodiac case when he began investigating the lone confirmed San Francisco slaying attributed to the serial killer. The detective, who was portrayed in the 2007 David Fincher movie by Mark Ruffalo, became obsessed with the case and worked on it for years.

About a week before the story on this front page broke, Toschi was trasferred out of the San Francisco Police Department’s homicide division after being accused of forging letters to Maupin about the case two years before.

Like the Zodiac case itself, this story was never completely solved.

In other news: Farther down the page, we see a story on Elvis Presley’s offering to become an FBI informant and another on prices of beer and hot dogs going up at Candlestick Park. Journalism like that gets us all shook up.

Top O’ the Top of the News: “Hundreds of strummers, plunkers, pickers and stompers descended upon the hills of Marin this week. Page 26.” No word on whether the jammers, slammers or knee-slappers showed up.

See more front pages: Go to SFChronicle.com/covers to search a database of hundreds of Chronicle Covers articles that showcase the newspaper's history.

Chronicle Covers is a project highlighting one classic Chronicle newspaper page from our archive every day for 366 days. Library director Bill Van Niekerken, producers Kimberly Chua and Michelle Devera, and editorial assistant Jillian Sullivan contributed to the project. Tim O’Rourke is the executive producer of SFChronicle.com. Email: torourke@sfchronicle.com Twitter: @TimothyORourke

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