EAST HAMPTON - Police say an autopsy has determined that the badly decomposed body found on a beach in Amagansett belongs to a man between 20 and 30 years old.The victim's remains were spotted Sunday by a man walking his dogs at Albert's Landing. Police say the body may have been in the Atlantic Ocean since the winter.Amagansett is nearly 100 miles east of Ocean Parkway, where 10 sets of human remains have been found since December. However, police say there is no evidence that this latest discovery is linked to the others.