Five years ago, Vaughn's family was shot to death inside their SUV near Channahon. Vaughn was spotted by a passing motorist on I-55. He was bleeding from his arm and leg.
"How did it happen?" asks Sgt. Gary Lawson on the tape.
"I don't understand. I don't know," Vaughn said.
For hours, Sgt. Lawson relentlessly questioned Vaughn about the details of that day. Still in a hospital gown, Vaughn appears confused and tired. He shows little emotion. More than once paramedics are called to check his wounds.
At first, Vaughn insists his wife, Kimberly, could not have done it. He initially said she did.
"I don't know why I would say that," Vaughn said. "She wouldn't do that. She's not that kind of person."
Later, under pressure, Vaughn is asked to guess what happened.
"The only thing I can think is that Kim somehow got a hold of my gun," Vaughn said. Then, later, he said, "She shot me, she shot the kids."
The interrogation continues as investigators try to fill the holes in Vaughn's story. The defendant is seen saying he stopped the car because Kimberly was sick, and then realized he was bleeding. He said he doesn't remember hearing a gunshot and that he never saw a gun. He also said he didn't think his family was in danger, so he left the vehicle in search of help for himself.
At one point, a second ISP investigator blows up at Vaughn and shows him pictures of his children.
"Look at the pictures!" the investigator says. "Look at it!! That's your blood on them, isn't it? What the [expletive] happened? I know what you did and you know what you did!"