PREVIOUS STORY: The victims have now been identified as 53-yr-old John Lang, 29-year-old Caleb Boozer and 24-year-old Jon Morris.



The 16-year-old also shot is recovering in the hospital where he told investigators there's at least one more shooter still on the loose.



The teen survivor tells investigators two men drove up to the camper-home and starting firing shots one after the other, one saying quote "make sure they're all dead."



Hamilton County Sheriff Jim Hammond says this appears to be a targeted shooting, not a random act of violence.



"How could someone be so awful?" said Andrea Hanawalt.



Andrea Hanawalt was shocked when she drove up on the scene minutes after the murders.



"I was parked right there when they found the casings and that's when they made me back all the way up," said Hanawalt



Family members of the victims arrived on the scene and turned to her, a stranger, to make calls the hospital and morgue, to find out if it was their loved ones gunned down. Investigators weren't releasing that info yet.



"She was trying to find out, found out he wasn't," said Hanawalt.



Deputies arrested 19-year-old Derek Morse early Thursday morning. They found a black Hyundai registered under his name at a nearby motel.



Channel 3 was the only camera rolling as they made the discovery just a few miles away on browns ferry road. But they say there is at least one more shooter still on the run.



Sheriff Hammond says it's possible drugs could've been the motive due to the criminal backgrounds of Morse and one of the victims, Caleb Boozer.



Detectives say the 16-year-old victim is recovering in stable condition at a local hospital.