Karen Read’s lead defense lawyer Alan Jackson urged jurors to find her not guilty Friday in a closing argument that disputed the prosecution’s entire timeline from the night Boston Police Officer John O’Keefe died in Canton, a suburb about 20 miles south of the city.

Read, 45, is accused of slamming her 2021 Lexus SUV into her 46-year-old former boyfriend and leaving him to die on the ground in a blizzard on Jan. 29, 2022.

“There was no collision,” Jackson told jurors. “There was no collision. There was no collision.”

Read’s defense and Brennan are expected to turn up the heat as they hope to convince jurors of their diametrically opposed claims about what happened to O’Keefe. According to the defense, her vehicle never hit him.

Read faces 15 years to life in prison if convicted on the top charge of second-degree murder. If convicted of drunken driving manslaughter, she would face 5 to 20.