The second of three days of the Karen Read murder trial scheduled for this week is set to begin at 9 a.m. in Norfolk Superior Court. Massachusetts Crime Lab forensic scientist Ashley Vaillier’s continued testimony is expected to begin the day.

Ashley Vallier, with the Massachusetts State Police Crime Lab, was the last to take the stand in the Karen Read murder trial on Monday. (Pat Greenhouse/Pool photo)

On Monday, the first Massachusetts State Police trooper took the stand. Lt. Kevin O’Hara, the team commander for the MSP Special Emergency Response Team (SERT), testified that he was called to 34 Fairview Road in Canton to search for evidence the afternoon of Jan. 29, 2022, the day John O’Keefe died.

Read, 44, of Mansfield, faces charges of second-degree murder, motor vehicle manslaughter and leaving the scene of a collision causing the death of O’Keefe, a 16-year Boston Police officer when he died at age 46.

O’Hara said that he and his team conducted a nearly hour-long search in the front yard of the home in the general area he was told O’Keefe’s body was found. During that search, he said, the team located “six or seven” pieces of a taillight, both red and clear plastic portions, as well as a black Nike sneaker.

Maureen Hartnett, a forensic scientist with the State Police crime lab, testified that she took those samples from the police and also analyzed Read’s Lexus SUV and other evidence in the case.

Hartnett said she allowed the frozen “red-brown stains” to thaw and then swabbed one of the cups to have it analyzed by an outside lab. She said she found similar “red-brown” stains on the t-shirt O’Keefe wore, as well as his hooded long-sleeved shirt or sweatshirt.

She also took a look at Read’s 2021 Lexus LX570 inside the police station’s sallyport. She said she conducted an “overall physical evaluation” of the vehicle for anything that should be reported for the investigation and remarked that the car was “in overall good condition,” but with damage to the rear passenger-side area.

This is a developing story.