A 64-year-old man fled his home April 21, 2021, after his 26-year-old son stabbed him in the head. Collapsing in his Bolingbrook, Illinois, front yard, the man screamed for help. The assailant followed him and repeatedly stabbed at the man’s upper body as they struggled on the grass. Neighbor Antonio Raul Rivera, a 50-year-old nonprofit organization executive, responded. He rushed the assailant, grabbed his arm to prevent him from stabbing the man again, and tackled him to the ground. Rivera secured the assailant to the ground while another neighbor removed the knife from the scene and others applied first aid until police and other first-responders arrived. Arriving police took the assailant into custody. The man was hospitalized for about three weeks as he recovered from wounds to his head, neck, and back and the partial amputation of a finger.