Jordan Morlan, from Louisville, died after falling into a coma following the horrific accident.
His mother Ginger Rodriguez, said Jordan tried to play a prank on his sister on Sunday by slipping his head through a noose they'd hung in the front yard for Halloween decoration.
The mother was doing laundry when her daughter came and told her that Jordan was hanging from a tree and not moving.
"I said well he's probably playing a prank on you because he was pranking us on other things that day putting up Halloween decorations," Rodriguez told local TV station WHAS 11.
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"Then I turned him around and I couldn't save him. I couldn't lift him up. He was hung," Rodriguez said.
Paramedics rushed the boy to a local hospital, where he was placed on life support, 'New York Daily News' reported.
He died from organ failure some 12 hours after the accident.
According to the investigators, the death was an accident, as the boy became disoriented after putting the noose around his neck and then passed out after it tightened.