Police are investigating the discovery of a man’s body near the Merrimack River in Manchester, N.H., on Sunday evening. Police have not identified the man, and did not specify his age. A resident of the area found the body near 280 Riverdale Ave., near the Pine Grove Cemetery, and called police at about 4:45 p.m., police said. Manchester police and firefighters were on the scene. The New Hampshire Union Leader reported Sunday that Kody Sharp, 22, who lived on Riverdale Avenue, has been missing since November, but authorities declined to say whether the body found Sunday belonged to Sharp.