A Knoxville area man remains in critical condition after falling off of a roof Tuesday morning. Lloyd Becker is at Mercy Hospital in Des Moines. The Marion County Sheriff’s Office reports that deputies and Knoxville Rescue responded to a 911 call at approximately 11:00am Tuesday reporting the incident. Arriving at the scene they found Becker with serious injuries, and transported him directly to the Knoxville Airport. Mercy One was not able to respond directly to the scene because of weather conditions, but was able to fly Becker to Mercy in Des Moines from the airport.