FORT EDWARD -- A State Police forensic scientist testified Monday that DNA from Matthew Slocum was on a cellphone that prosecutors have said was owned by murder victim Joshua O'Brien.

The scientist, Daniel Myers, also testified that blood from murder victim Lisa Harrington was found on a pair of black shorts submitted for testimony.

However, Harrington's DNA was also found on a tank top shirt that was worn that day by Slocum's girlfriend, Loretta Colegrove, who the defense has blamed for the killings.

Washington County prosecutors have said those shorts were worn by Slocum the day of the triple homicide.

Myers also testified about DNA found on the shotgun that was believed to have been used to kill the three victims belonged to Lisa Harrington, but that an unknown donor's DNA was also found on parts of the gun.

A portion of that DNA profile matched Slocum's profile, Myers said.

But he said separating Slocum's DNA from Lisa Harrington's DNA was "very difficult" because they share DNA in light of the fact Harrington was Slocum's mother.

"Half of his alleles (DNA markers) will be there," Myers testified of the samples where Lisa Harrington's blood was found.

Myers is to be cross-examined after lunch.

The prosecution's first witness of the day was a blood spatter expert, who testified about blood stains.

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DNA expert: Slocum DNA on victim's phone