Detectives in Frederick, Maryland, said an untested section of bedding held the key to identifying who killed a 23-year-old woman in her apartment more than 37 years ago.

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Delores Marie “Mooda” Thompson was found dead in her apartment in the 100 block of S. Market on Feb. 1, 1988, according to a Frederick Police Department news release . Police said she died of “ligature strangulation” and that the case included evidence of a sexual assault.

At the time of her death, police said DNA testing was “in its infancy” and samples of evidence failed to find

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