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A double murder in Napa Valley plagued the town's residents until police finally found a smoking gun

The murders of two young women took place in 2005, and it would a handful of cigarette butts that proved integral to solving the case

"The killings affected everyone," one local told PEOPLE. "It was like a Halloween movie come true."

A grisly double murder in Napa Valley plagued the town's residents for a year — until three cigarette butts proved the smoking gun of the case.

PEOPLE reported on the murders shortly after they took place in October 2005 when, in the early morning hours after Halloween, an intruder broke into an unlocked window in Leslie Mazzara and Adriane Insogna's Napa Valley, Calif., house and slashed both women to death with a knife.

The murders were sho

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