A dad was so affected by the death of 22-month-old Cooper Harris in a hot car that he videotaped himself sitting in a hot car to understand what the child's last moments must have been like.
In the video he says, "It's 86 to 90 degrees outside."
Sweating profusely, father of three Terry Bartley of Raleigh North Carolina, lasted just 20 minutes.
"I can barely breathe out here and my system is stronger than these little kids' systems," noted Bartley.
Little Cooper's dad, 33-year-old Ross Harris, is charged with felony murder. Prosecutors say he deliberately left the boy in the car to die. He claims it was an accident.
Terry posted the video to YouTube as a warning to parents not to leave their children in hot cars. The video is going viral with over a million views.
Others parents are getting the message out too, making videos of themselves suffering in cars as the temperature soars.
One man says in their video, "The temperature is about 106 degrees!"
A woman in her video said, "As you can see, I'm sweating a lot. My hair's all frizzy. I'm as red as a tomato," said another.
Another parent said in their video, "It's impossible to breathe in here after just 15 minutes."
"I can't take much more," said one man in his video.
INSIDE EDITION's Megan Alexander spoke with Terry Bartley via Skype, asking, "Describe what it was like to be in that car."
Bartley replied, "If I had stayed in there a little longer, I would have passed out and somebody probably would have been coming to rescue me."
And a couple whose baby died in a hot car is using their tragic loss to warn others about the dangers.
Brett Cavaliero of Austin, Texas accidentally left his one-year-old daughter, Sophia, in his car in 2011. Cavaliero told INSIDE EDITION, "I made a terrible mistake and it can happen to absolutely anyone."
Mrs. Cavaliero said, "You experience a new level of pain that is so strong it knocks you to the floor and you struggle to breathe."
But she says whether little Cooper's death was an accident or something more sinister, all parents need to be careful never to leave a child in a car.
"We do try to redirect the public focus to what it should be, which is preserving the safety of our precious little babies," said Mrs. Cavaliero.