In the retrial of Karen Read, accused of killing her boyfriend, Boston police officer John O'Keefe, forensic data from O'Keefe's phone was examined, revealing its location near a flagpole and a temperature drop suggesting he was outside. The defense argues a conspiracy involving the police, suggesting O'Keefe was killed inside the home, and questions the timing of a web search that might implicate another individual, Jennifer McCabe. Despite a mistrial in the first trial due to a jury deadlock, the second trial proceeds with similar arguments, and the U.S. Supreme Court has rejected a double jeopardy appeal by Read's defense. McCabe testified about the evening's events, including seeing Read's SUV, but not Read or O'Keefe, and described a frantic call from Read the next morning. Jurors visited the crime scene to better understand the setting, with instructions to consider various perspectives and the impact of the snowstorm on visibility and conditions that night.

Digital forensics expert Ian Whiffin testified that location and temperature data from O'Keefe's phone indicated it was near a flagpole outside the house, with no activity after 12:32 a.m. and significant temperature drop, suggesting he remained outside.

Defense attorneys argue against the accuracy of the forensic data, suggesting a larger radius where the phone could have been and propose a conspiracy involving the police, pointing to possible murder inside the house.

A contentious point in the trial is a web search about dying in the cold conducted by Jennifer McCabe, with conflicting testimonies on when the search occurred, potentially implicating McCabe instead of Read.

McCabe testified that she saw Read's SUV outside the party house but did not see Read or O'Keefe enter, and recounted Read's distressed phone call the next morning as they searched for O'Keefe.

Despite a previous mistrial and an appeal to the U.S. Supreme Court regarding double jeopardy, the court declined to intervene, allowing the retrial to proceed with charges of second-degree murder, manslaughter, and leaving the scene.

Jurors were taken to the crime scene to assess the area where O'Keefe was found and to consider the conditions during the snowstorm, with guidance on viewing perspectives and the positioning of Read's SUV.

The trial has featured contrasting narratives, with the prosecution asserting Read's guilt in hitting O'Keefe with her SUV, while the defense maintains her innocence and suggests alternative scenarios involving other parties.