Using DNA evidence, prosecutors Tuesday linked Keith Mackowiak's stained clothing and other evidence to the 2007 double homicide of Aloysius and Catherine Twardowski of Seneca.

Jessica York, an expert forensic analyst from the DNA Diagnostic Center in Fairfield, Ohio, was first on the witness stand to formally introduce and explain how an accredited laboratory deciphers a complex DNA profile.

From evidence supplied by the Illinois State Crime Lab from the investigation of the murders of Twardowskis, York detailed results from her personal scientific examination of gloves believed to have been worn by the defendant during the crime.

The cloth gloves were found by police days after the killings in a fast-food bag discarded on U.S. 6 between Morris and Seneca, following information allegedly suppled by Mackowiak in an interrogation session in July 2007.

The expert said her analysis of the gloves, inside and out, found the DNA profiles were "consistent" with those of Aloysius Twardowski and Mackowiak, meaning there was a good statistical chance blood or other genetic material from both the victim and defendant had been in contact with the gloves.

York added that her DNA analysis found no link to Catherine Twardowski and Mackowiak's next door neighbor and one-time suspect, David Dulabhan of Seneca.

Of Dulabhan's clothes worn by him the week of the murders, York said her forensic testing could not exclude Aloysius Twardowski's DNA from miniscule spots found on his confiscated shorts and shirts.

State's Attorney Brian Towne's has argued that Dulabhan told the truth when he testified last week that Mackowiak "flicked" blood from a victim on him during a return car trip to the Twardowski house by the two former friends the day after the murders.

York's immediate supervisor, Dr. Julie Heinig, verified to the court the DNA results with her own independent review of the data.

As the state's case against Mackowiak enters its second week, more DNA profile evidence is expected to be presented by prosecutors.

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DNA evidence presented against Mackowiak