CEDAR RAPIDS — “This isn’t over,” Sarah Lathrop said after the Linn County Attorney’s Office decided last week not to file charges in her husband’s slaying. “This is just the beginning. We’re not quitters,” she said. “We’re gonna fight till the end, and something’s going to change.“My husband was murdered, and someone needs to be held accountable.”Joshua Lathrop, 34, was killed May 30 at a mobile home park in Hiawatha when an argument involving five individuals — including Lathrop — escalated into a shootout.