A Suffolk judge has granted a request from twice-convicted murderer John Bittrolff to compare DNA from accused serial killer Rex A. Heuermann to unknown DNA found at one of Bittrolff's crime scenes in a quest to clear the incarcerated Bittrolff's name.

Judge Richard Ambro, in a Friday order, granted the defense request to compare unknown genetic material found at the scene of one of the murders Bittrolff is convicted of to a profile of Heuermann, who is currently charged in the 1993 killing of Sandra Costilla, a case Bittrolff was previously a suspect in.

Ambro wrote that the presence of the unknown DNA "has the potential to create a reasonable probability that the verdict could have been more favorable to the defendant had such evidence been made available to the jury and proved to have

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