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 second week of Karen Read's trial has concluded following testimony from key witness Jennifer McCabe, forensic scientist Hannah Knowles and digital intelligence expert Ian Whiffin