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Abernathy, who confessed to the crime when he was 18, may have suffered from a “diminished mental capacity,” prosecutors said. They tested all available evidence in the case and found that Abernathy’s DNA profile matched none of it.
“This is difficult for all parties including the victim’s family, but I cannot and will not let a wrongful conviction stand,” Cook County State’s Attorney Anita Alvarez said in a statement.
At the time of the crime, law enforcement did not have the scientific ability to conduct DNA analysis that exists now, she said.
Alvarez started a “Conviction Integrity Unit” in 2012 to focus on reviewing cases involving questionable convictions. Thirteen defendants have since had their convictions vacated.
Such efforts are part of a national trend, according to the National Registry of Exonerations, a project of the University of Michigan Law School.
The number of people exonerated in the United States in 2014 climbed to a record high 125, partly because of work by prosecutors willing to admit their mistakes, the registry found last month.
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