In her theory, little Tony passed out from breathing carbon monoxide. The fire grew. Ceiling tiles broke down and fell. Fed by more oxygen, much thicker, hotter smoke billowed into the room.
"Very quickly, he is going to inhale those products, and he is going to die very quickly from those products," McAllister said.
For Bunch's lawyer, the new toxicology evidence leads to only one conclusion.
"The fire could not have started in the living room, it could not have started in the bedroom," Raley said. "So we know that the fire could not have happened the way the state claims. ... It just can't happen."
But if the fire did not happen as the prosecution claimed it happened, why wouldn't a new trial be guaranteed?
"Well," Raley said with a sigh, "it's always difficult to unravel a wrongful conviction."
Decatur County, Ind., prosecutor William Smith said he believes the "new" science was already rejected by the jury.
He said Raley just wants to substitute her expert's opinions for that of the jury.
The court ruling could come at any time. This first appeal is the least likely to succeed, said Raley, who vows that she is prepared to keep going to higher courts in an effort to get Bunch a new trial.