The incident happened around 3 p.m. on Saturday in a neighborhood near Jordan High School.
William Chesser, who lives in the neighborhood, said he heard a loud pop around the same time.
"We could hear [it] all the way up in the house," he said. "We get a fair amount of hunters back here in the woods, and we're used to hearing occasional shotgun blasts. But this was obviously different."
Police responded to a wooded area off King Charles Road Saturday. When they arrived they found the boy dead.
Moments later, Chesser said he and his wife saw two scared looking teenage boys emerge from the woods.
Cheeser said the teenagers told his wife that their friend had climbed a transmission tower. They said they were students at Trinity School and had warned their friend against climbing the tower.
Officials said the victim was electrocuted and fell into a pond.
Police think the death was accidental.