George Floyd's cause of death, ex-cop's force will be keys at trial

A Minneapolis police officer was swiftly fired and charged with murder after bystander video showed him pressing his knee into George Floyd's neck, ignoring the Black man's cries that he couldn't breathe. But even with that powerful footage, legal experts say the case isn't a slam dunk. Jury selection begins Monday in Derek Chauvin's trial, which is expected to come down to two key questions: Did Chauvin's actions cause Floyd's death, and were his actions reasonable?