Seventy-year-old Roger Reece Kibbe was serving a life sentence for the 1987 strangling of a teen prostitute when he pleaded guilty in September to the six other slayings.

As part of his plea deal, Kibbe agreed to help authorities find the remains of Lou Ellen Burleigh, who disappeared from Walnut Creek in 1977.

Kibbe's victims were found along Interstate 5, leading to the nickname “I-5 Strangler.”

San Joaquin County prosecutors didn't pursue the death penalty because of Kibbe's age and the slow pace of executions in the state.

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