The 10th day of testimony in the Karen Read murder trial began with a rapid-fire cross-examination of Brian Albert, the owner of the home where Boston Police Officer John O’Keefe lay dead or dying on the yard in the early morning of Jan. 29, 2022.

“All that chaos on the front lawn, you never came out to assist in any way whatsoever, did you, Mr. Albert?” defense attorney Alan Jackson said shortly before the court took its morning recess.

Witness Brian Albert testifies during the trial of Karen Read at Norfolk County Superior Court Friday in Dedham. (AP Photo/Charles Krupa, Pool)

Jackson was questioning Albert’s testimony on Friday that neither he nor his wife had heard Karen Read screaming, “hysterically,” as first responders testified in the first week of trial, nor the commotion of those first responders.

He also said that he hadn’t seen the police and ambulance lights because he was asleep and the curtains were shuttered in his bedroom, which is upstairs and has the windows closest to the left side of the yard where O’Keefe’s body would be found.

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 and her boyfriend of about two years when he died at age 46. Prosecutors say that after a night out drinking the pair argued and she killed him by backing her Lexus SUV into him at high speed, leaving him to die in the cold during a major snowstorm.

Albert is a recently retired Boston Police sergeant, last assigned to the department’s fugitive capture unit. He testified Friday that he had met O’Keefe a few times before he died, that they had a “cordial relationship, and that he “considered him a co-worker, even though we never worked together.” He also said he had “an enormous amount of respect” for O’Keefe for taking in his niece and nephew when their parents died.

But Brian Albert is also one of three people that defense attorney David Yannetti identified as being in 34 Fairview Road — the house Brian Albert then owned with his wife Nicole Albert — when he alleges O’Keefe was onsite and had motive and opportunity to kill O’Keefe. The defense has developed a third-party killer theory and has alleged a massive frame-up job to ensnare their client.

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The other two Yannetti identified are ATF Agent Brian Higgins, who is a friend of Albert’s and allegedly had a romantic connection with Read, and Colin Albert, Brian Albert’s nephew, whom Brian Albert testified under cross Friday was a large, athletic teenager who played on the football team.

Also playing into the defense’s theory is Chloe, a 70-pound German shepherd mix the Alberts owned for “six or seven” years before rehoming the dog in May 2022, just months after O’Keefe died.

Defense attorneys have suggested that wounds on O’Keefe’s arms could be dog bites and that the dog — who both Albert and his wife said was rehomed after biting a woman — participated in an attack on O’Keefe in the home’s basement.

The attorneys are back at it today.

This is a developing story.