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Sumter County Sheriff's Office

A Florida teenager was found dead in a swamp after his family tracked his iPhone to a nature preserve in Central Florida.

Sumter County officials organized a massive search for 18-year-old Charlie Roberts, Jr., whose phone was tracked to the Green Swamp Wildlife Management Area.

Searchers combed the densely wooded, 50,000 acre swamp that spans three counties.

They used helicopters, ATVs and drones until they found his body Wednesday night, according to People magazine.

Detectives say Roberts was shot to death and his body dumped in the swamp.

On Thursday, detectives arrested David Anthony Gracia, 19, of Lakeland, and charged him with first-degree murder in Roberts' death.

Investigators declined to explain the relationship between Roberts and Gracia.

"I want the person to be prosecuted to the fullest, of course. This was a family member, a child, nobody deserves death," the teen's cousin William Gamble told Fox13.

"What would cause you to want to kill a child? What did he do so wrong that it deserved death... and to be left where he was left at?"