An amateur sleuth heads to the Sierra in search of the Zodiac Killer’s tracks

Late last year, Fayçal Ziraoui, a French-Moroccan business consultant, was at his home in the Paris suburbs scrolling through satellite pictures of the Sierra Nevada when he came across an image that startled him.

It was a collection of rocks arrayed in a way that resembled the cross hairs of a giant gun sight — a circle with a cross through it — surrounded by a larger circle. It looked to him like the symbol that the Zodiac killer used on his correspondence a half-century ago.

One of my colleagues in The New York Times’ Paris bureau, Constant Méheut, wrote about Ziraoui two years ago and his interest in the case of the Zodiac, the spree of murders that terrified the Bay Area. In December, Ziraoui searched satellite images of the Sierra after believing that a postcard and a cipher sent by the Zodiac killer pointed to those coordinates.

Ziraoui spent the winter counting down the days until the snow melted, and in mid-May, he flew to San Francisco. I traveled with him to the site west of Lake Tahoe. It’s a four-hour drive from the Bay Area, the last dozen miles on rough dirt roads blocked at times by the remnants of collapsed trees killed in the 2014 King fire.

We reached the site by driving up a rock-strewn stretch of road that you might see in a commercial for four-wheel-drive vehicles, a steep grade to the top of an unnamed small plateau, elevation 6,000 feet, overlooking the Hell Hole reservoir. Despite the name, it’s an idyllic spot with patches of light purple and yellow wildflowers and a view of the snowy peaks that surround Tahoe.

The outer circle of the rock formation is about 25 feet wide, and some of the stones are big enough that it looks as if a few people would be needed to move them. Inside the inner circle were various objects: a small-caliber bullet, some shattered eyeglasses, three pieces of obsidian and a poker chip. Outside the circle a trail of rocks pointed north.

After visiting the site, Ziraoui spent days trying to understand who might be behind the rock formation and whether it had any connection to the Zodiac killer. He showed pictures of the site to an archaeologist at the local U.S. Forest Service office, who said he had never seen the place and was not aware of anything else like that in the area. He researched medicine wheels — round symbols used by many native tribes — and contacted the United Auburn Indian Community, a group of Miwok and Maidu tribal members in the area. A spokesperson for the United Auburn preservation department said the tribal group had no knowledge of the site and declined to look at photos of it.

Maybe hikers had put the rocks together? Or was it lovers? Inside the circle was a smooth rock with a professional-looking engraving: “Cal &Margaret Together Forever.”

The search for the Zodiac killer has spawned a cottage industry of sleuths, each with their own notions of how to crack the Zodiac codes and their own theories on the identity of the killer. With each new “revelation,” a strong dose of skepticism seems warranted.

For Ziraoui, researching the Zodiac killer started as a bored-at-home hobby during the pandemic. When he spoke with the Times two years ago, Ziraoui had concluded through his examination of one of the Zodiac killer’s ciphers known as Z13 that the Zodiac was Lawrence Kaye, a South Lake Tahoe resident who had been a suspect in the case. And in trying to decrypt another one of the ciphers, known as Z32, Ziraoui had come up with coordinates that led him to a school in South Lake Tahoe.

Last year, however, Ziraoui tweaked his calculations, using a different calculation for magnetic north, and his new coordinates pointed to the Hell Hole reservoir. He got the same general result when he tried to interpret another coded message believed to have been sent by the Zodiac killer, in a postcard sent to The San Francisco Chronicle in 1971.