Katie McLaughlin, a Canton firefighter paramedic who responded to the scene, testified Monday.

Prosecutors allege that Karen Read struck her boyfriend, John O'Keefe, with her Lexus SUV outside of another officer's home and left him to die in a blizzard.

Prosecutors allege Karen Read struck her boyfriend, John O'Keefe, with her Lexus SUV outside of a get-together at another officer's home and left him to die.

The U.S. Supreme Court has denied Karen Read’s petition for certiorari, and therefore will not review her case.

Prosecutors allege that, following a night of drinking, Karen Read struck her boyfriend -- Boston police officer John O'Keefe -- with her Lexus SUV and left him to die.

The prosecution alleges that Karen Read struck her boyfriend, John O'Keefe, with her SUV then left the scene as the area was hit with a major blizzard.

Karen Read arrived in court for the first day of her second murder trial as her defense team maintains her innocence, saying she is the victim of a police cover-up.

Karen Read has filed an emergency petition with the Supreme Court seeking an immediate stay of her trial pending review on her claims of constitutional violation.

Karen Read's second trial is set to begin on Tuesday, after her first trial ended in a mistrial with the jury unable to reach a verdict.