It seems these deaths at the hands of police come in waves. Yesterday, police in El Cahon, Calif. shot and killed 30-year-old Alfred Olango. Al Jazeera reports that Olango's sister called police for help, saying that Olango was behaving strangely. There are also reports that Olango, who was unarmed, was suffering a seizure before he was shot. And last week, before we even knew about Boyd, we were mourning 40-year-old Terence Crutcher, who was shot by Tulsa Police Officer Betty Shelby. Crutcher's car had broken down. His hands were in the air when Shelby shot and killed him.