Bonnie Woodward is seen in this undated family photo. Courtesy Rachel Lee

A husband's chilling words to his wife -- "I have killed for you" -- finally cracked a cold case murder that had haunted an Illinois town for nearly a decade.

Bonnie Woodward, a 47-year-old mother of four, vanished from her workplace parking lot in Alton, Illinois, on June 25, 2010.

A nurse's aide at Eunice Smith Nursing Home for 25 years, Woodward was last seen talking to a man after her shift. Witnesses described him as a white male with salt-and-pepper hair, driving a silver or gray Chevy Malibu.

A new "20/20" episode, "I Have Killed For You," airing Friday, June 6, at 9 p.m. ET on ABC and streaming the next day on Hulu, examines the case.

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