A Navy SEAL called by prosecutors to testify at the murder trial of a colleague has acknowledged killing a wounded prisoner in Iraq in what he described as an act of mercy. Also, local reaction to Gov. Newsom’s apology to California Native Americans for state-sponsored genocide, the pros and cons of San Diego’s gunshot detection system, scientists are trying to measure the value of outdoor service work for transitioning veterans, and Imperial Valley will celebrate hometown hero and heavyweight boxing champion Andy Ruiz Jr. with a parade.