An 18-year-old East Hampton man was involved in an accident that left one man dead in Flanders Tuesday morning. Southampton Town police said Kevin Montano of East Hampton was driving a Ford pickup truck north on Flanders Road, and Marcelo Viscalla-Diaz, 20, of Flanders was driving south in a Chevrolet TrailBlazer when the two somehow collided near Bellow Pond Road around 7 a.m. Officers found Mr. Viscalla-Diaz unresponsive and trapped in the TrailBlazer. They called for a heavy rescue squad and ambulances to respond. Hampton Bays Fire Department volunteers freed Mr. Viscalla-Diaz, but it was too late. He was pronounced dead at the scene. Lt. Susan Ralph said Mr. Montano was treated for non-life-threatening injuries. A New York State Police Accident Reconstruction Unit is assisting the Southampton Town police detective squad in the investigation of the cause of the accident. Flanders Road is a state road, Route 24. No charges have been filed.