DOUGLAS COUNTY, Colo. — Trace DNA from the inside of a paper bag that had not been touched in nearly 40 years connected one of Colorado's most prolific serial killers to the 1987 killing of 30-year-old Rhonda Marie Fisher.

"Obtaining a DNA profile from paper bags nearly 40 years old is exceptionally rare, highlighting how critical a careful case and evidence review is," said Douglas County Sheriff Darren Weekly as he announced that Fisher's case was closed.

On Tuesday, he announced that Vincent Groves, who died in prison in 1996, was responsible for Fisher's murder. Weekly called Groves one of the state's "most prolific serial killers" and said he targeted vulnerable women between 1978 and 1988.

"He was involved in sex trafficking and drug distribution. He was convicted of murder in 198

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