A Knoxville man drowned Thursday evening (7/4) at Lake Red Rock.  The Marion County Sheriff’s Office says it was called at 6:12pm Thursday about a man who was swimming outside the designated swimming area at North Overlook Beach and didn’t resurface.  About 20 minutes later, Tyson Te Aundre Marshall of Knoxville was found and taken to shore.  First responders tried to save him, but Marshall died shortly after 7pm at Pella Regional Medical Center.