A driver found the body on the Father Hurley Boulevard exit to the southbound lanes of the highway at about 4:10 a.m. Thursday and called police. A car was not found at the scene.
The ramp was closed during the morning rush hour. It reopened at about 10 a.m.
Police spokesman Lt. Paul Starks said the man "suffered trauma." He said the case is being investigated as a homicide.
The victim was described as an Hispanic man in his late 30s or early 40s, standing about 6 feet tall and weighing about 260 pounds. He had short dark hair under a brown knit cap. He also wore a brown leather waist-length jacket, blue jeans with embroidered designs on the rear pockets, and brown ankle-high cowboy style boots. He also wore a brown leather belt with a large belt buckle. He was wearing jewelry which included four necklaces, three of which were beaded and one that was silver in color with a gold colored skeleton key charm.
Police are asking anyone who has information about the victim or the case to call 240-773-5070.