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’s second murder trial began Tuesday with a prosecutor saying the defendant’s own words will bolster evidence that she killed her police officer boyfriend three years ago and a defense attorney calling the case “the definition of reasonable doubt.

Watch live as Karen Read's second trial starts today with opening statements in the Massachusetts murder case.