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There's A New Book Out By A Man Who Claims The Zodiac Killer Was His Father

And it was apparently kept secret for months.

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An explosive and historic book of true crime and an emotionally powerful and revelatory memoir of a man whose ten-year search for his biological father leads to a chilling discovery: His father is one of the most notorious-and still at large-serial killers in America.Soon after his birth mother contacted him for the first time at the age of thirty-nine, adoptee Gary L. Stewart decided to search for his biological father. It was a quest that would lead him to a horrifying truth and force him to reconsider everything he thought he knew about himself and his world.
Not mentioned in the summary: Stewart, a vice-president at a cleaning company in Baton Rouge, alleges that his father was the Zodiac Killer, who is believed to have killed at least five people in Northern California, and famously sent letters and cryptograms to Bay Area newspapers. The murders were never solved.Stewart reached the conclusion that his father was the serial killer after twelve years of research, Tina Andreadis, a publicist at HarperCollins, told me today.
The Zodiac murdered victims in Benicia, Vallejo, Lake Berryessa, and San Francisco between December 1968 and October 1969. Four men and three women between the ages of 16 and 29 were targeted.

The killer gave the name "Zodiac" in a series of letters sent to the local press, which contained cyphers.

It's not the first time someone has claimed to have revealed the killer's identity.

Justin Sullivan / Getty

In 2009, Deborah Perez, above, claimed that she wrote some of the letters her father, who died in 1983, sent to police officers, and gave a pair of glasses she believed belonged to one of the killer's victims to police.

She's hardly the only person whose testimony has subsequently been found to be dubious.

This post has been corrected to reflect the fact that some of the information came from Wikipedia.