I first learned her name on the night of May 29, 2020, four days after her video went viral. By now we had watched it multiple times—transfixed by the horrifying nine minutes, a policeman with his knee on a Black man’s neck, gazing with a kind of reptilian menace in the general direction of the camera, while the life drained out of the body beneath him. We had listened in shock to the victim’s pleas, his desperate cries that he could not breathe, and finally we heard him call out for his mama.