GALT — An unarmed animal control officer was shot and killed in Sacramento County on Wednesday while trying to retrieve pets from a home whose owner was evicted the previous day. The officer had gone to the home to rescue dogs and cats authorities thought had been left behind, a day after Joseph Francis Corey was served an eviction notice and a sheriff’s deputy changed the locks. The officer — Roy Curtis Marcum, 45, of Elk Grove — and a bank employee knocked on the door when Corey fired a shotgun through the door, striking the officer in the torso, …