Wildlife and environmental officials April 23 wrapped up the field work to determine what killed 28,613 fish in a 3-mile stretch of Rocky River in the Cleveland Metroparks, including Mill Stream Run Reservation, over the past few days. Ohio Division of Wildlife spokesperson Jamey Graham said officers were collecting water and soil samples between the Bonnie Park picnic area and Wallace Lake into the night , and the Ohio Environmental Protection Agency is testing the samples. "We have not determined a cause," Graham said, adding that tests from the EPA could take anywhere from a few days to months to...