The 58-year-old was killed in a hail of gunfire last month, after stepping outside to find nearly a dozen Border Patrol agents and at least one tribal police officer advancing on his property in the dark. Late last week, a tensely awaited medical examiner’s report ruled the case a homicide, finding that Mattia was shot nine times. Border Patrol body camera footage released at the same time confirmed that what the authorities thought was a gun was in fact Mattia’s cellphone.