A dad found his 16-year-old son crushed to death by a folding seat in a Honda minivan as it was parked outside his school.
Kyle Plush somehow became pinned down by the third-row flip seat in a 2002 Honda Odyssey.
It is believed the tragic boy was reaching for his tennis kit in the back of the car when he dislodged a latch and the bench seat flipped backward.
The force left him trapped upside down underneath the seat, it is understood.
Kyle managed to use the Siri function on his phone to dial 911 and call for help at around 3pm on Tuesday.
He told them he was trapped in a gold Honda Odyssey in the car park of Seven Hills school in Madisonville, Ohio.
The operator could hear banging and gasping but struggled to make out what Kyle was saying, police said.
But at one point he was heard to say: "I probably don't have much time left, so tell my mom I love her if I die."
Police were dispatched to the scene but they did not find the Honda.
The officer tried calling the boy's phone but he didn't answer.
The officer told dispatch he feared the call was a prank.
Kyle managed to call police again saying: "This is not a joke...I am trapped inside a gold Honda Odyssey van in the parking lot of Seven Hills...Send officers immediately, I am almost dead."
Police were dispatched once again but didn't find the trapped boy.
It later emerged he was in an overflow car park at the school that hadn't been searched.
When Kyle didn't return home from school, his mother Jill raised the alarm.
His family had believed he was at a tennis match.
Finally, more than six hours after Kyle had first called for help, he was found by his father at 9pm.
Paramedics battled to save him but he was declared dead at the scene.
A coroner has given cause of death as "asphyxia caused by chest compression."
Cincinnati Police Chief Eliot Isaac has launched an investigation into how the calls for help were handled.
"Something has gone terribly wrong," he said.
"We need to find out why."
Prosecutors are also examining the case.
Seven Hills school described Kyle as "a young man of keen intelligence, good humor, and great courage, and this whole community feels this loss very deeply."
Honda spokesman Chris Martin told WCPO News channel: "Our hearts go out to the victim’s family during this difficult time."
He told the Cincinnati Inquirer: "Without further details about the incident, I’m not in a position to speculate about what happened.
"It would be premature to speculate that a vehicle defect was involved."