MOSCOW — Authorities say a southeast Iowa man and the horse he was riding were killed by a lightning strike. The Muscatine County Sheriff’s Office says 35-year-old William J. “Billy” Clevenger and his horse died Monday night when they were struck by lightning near Moscow in rural Muscatine County. Deputies were called to a property Monday night and found Clevenger and another man, John R. Jenkins. Both men were taken to a Muscatine hospital, where Jenkins was treated and then released and Clevenger was pronounced dead.