Among key arguments in Karen Read’s defense is that the injuries on John O’Keefe’s arm were marks from an apparent animal attack.

Ms. Read’s retrial on charges that she killed her boyfriend, a Boston police officer, has so far largely resembled her first, which ended in a mistrial.

The prosecution says Karen Read hit her boyfriend, John O'Keefe, with her Lexus SUV outside of a home in Canton during a snowstorm on Jan. 29, 2022. Her defense argues that someone else was responsible for killing O'Keefe.