Famed crime writer brings Zodiac Killer controversy to Bay Area event

In the 2007 film “Zodiac,” Jake Gyllenhaal, as political cartoonist-turned crusading sleuth Robert Graysmith, lays out the chain of facts and coincidences that lead him to believe he’s discovered the identity of the elusive Zodiac Killer. But after listening, Mark Ruffalo, as San Francisco Police Department Inspector Dave Toschi, concedes it could be true but says: “I can’t prove this.”

With that, director David Fincher ends “Zodiac” in an unsettling but perhaps realistic way, suggesting...