Just before 4 p.m., Hector Alaniz’s mother called police to “report that her son was suffering from mental illness and may be a danger to others,” Officers saw that he had what appeared to be a black pistol, and as he entered a driveway, he pointed the gun at officers, prompting the use of a 40 mm less-lethal launcher and at least one officer to open fire, police said. “Despite the suspect being struck by both gunfire and 40mm [less-lethal] projectiles, he again continued to flee until an officer discharged a TASER, incapacitating Alaniz, allowing officers to take him into...