The San Bernardino, California sheriff released new body-camera footage of the fatal police shooting of 15-year-old Ryan Gainer, who was holding a gardening tool.The Saturday killing of Gainer, who was autistic and having a mental health crisis, sparked national outrage and escalating criticisms, prompting the head of the department, sheriff Shannon Dicus, to show reporters additional footage during a Wednesday press conference. The sheriff also revealed that it appeared two deputies on the scene had fired three rounds at Gainer.Dicus repeatedly defended the deputies’ use of lethal…