Rescue teams are searching Center Hill Lake for a missing boater, according to WSMV, Channel 4.Authorities said two men were in a canoe at Rock Island State Park when the canoe capsized.One man made it to shore, but there has been no sign of his friend. Family members say the missing man had undergone recent cancer treatments and was not strong enough to swim back to shore once the boat tipped.Authorities have not released the men’s identities.If it is confirmed to be a drowning, it will be the fourth downing death at Rock Island State Park since July Fourth weekend. Two people died in separate incidents in a 24-hour span over July Fourth.A 41-year-old Murfreesboro man drowned Sunday, July 31, on a family outing.