DNA evidence tied Chanthakoummane to Sarah Walker’s murder at a model home in Collin County. In last-minute appeals, his attorneys argue the evidence was not conclusive. texasnews kprc2 click2houston
But analysts also determined his DNA was on Walker’s fingernails and elsewhere at the crime scene, and that evidence largely has convinced the courts they have the right man. In his last appeals to Collin County and the Texas Court of Criminal Appeals filed last week, Chanthakoummane’s attorneys argued that the DNA evidence is also questionable.
In a court filing, the Collin County district attorney’s office replied that “Chanthakoummane presents no new science in the field of DNA analysis, and even if there were something new, he fails to show it would have prevented his conviction.”After Walker was killed, police initially looked at people close to her.
Police and prosecutors rejected the statement, but Chanthakoummane’s lawyers say new scientific research shows his DNA could have been transferred to Walker’s fingernails without any direct contact between them — for instance, if she touched an object he had left a blood mark on. The National Institute of Standards and TechnologyAdbecause his DNA was found on the fingernails of a homicide victim.
The prisoner’s attorneys also noted new DNA testing done last year on samples from a plant stand, thought by prosecutors to have been used to fatally beat Walker, did not match Chanthakoummane and instead possibly implicated another person.
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