The heartbroken widow of a hero police officer killed on duty wept as his alleged killer appeared in court. Stephanie Diller fought back the tears after the prosecution described how a bullet allegedly fired by Guy Rivera, 35, "ripped through" her husband Jonathan Diller. The court in Queens, New York City, was told graphic details about Mr Diller's injuries, including a severed artery. Ms Diller became so disturbed she left the courtroom twice to compose herself during the start of Rivera's