Only 17 at the time, Darnella Frazier is to the Floyd killing what Abraham Zapruder was to the assassination of John F. Kennedy, an accidental bystander with a camera, a vital witness to an historic moment. Ms. Frazier's video of the arrest, which recorded Floyd's plea - I can't breathe - as Chauvin knelt on his neck for more than 9 minutes, sparked protests across the country. A witness at Chauvin's murder trial, Ms. Frazier expressed regret for not physically confronting Mr. Chauvin. “It’s been nights I stayed up apologizing and apologizing to George Floyd for not doing more and not physically interacting and not saving his life,” Ms. Frazier said.