The single hair had been the only piece of physical evidence linking Claude Jones to the crime scene. But the DNA analysis found it did not belong to Jones and instead may have come from the murder victim.

Barry Scheck, co-founder of the Innocence Project, a New York legal center that uses DNA to exonerate inmates and worked on Jones’ case, acknowledged that the hair doesn’t prove an innocent man was put to death. But he said the findings mean the evidence was insufficient under Texas law to convict Jones.