"He was familiar with accelerants and how fires reacted," said Dalton. "And the amount of gas that was used especially in the bedroom area and where it was located made it very clear that he was attempting to start a fire that would quickly engulf that bedroom, as well as the entire house. And he accomplished that."
On Feb. 27, 2009, following the ATF investigation and after months of maintaining his innocence, Jason Henry, now older and appearing to have been hardened by jail time, admitted to setting the lethal fires in an attempt to get insurance money.
But his parents had not taken out insurance on their home.
Still, the question remains: Why did Jason Henry meticulously pour gasoline around his parents' bed and give them no chance to escape alive?
He pleaded guilty to two counts of aggravated manslaughter.
The prosecutors believe ATF's work was critical in getting the guilty plea.
"Most cases just get detective work, investigative work. The glamour of the forensics or the CSI, so to speak, is rare. … So a case like this, where we were really able to narrow it down to a science, where we could put it in front of a jury, really strengthened this case," Anton told ABC News.
Dalton added, "ATF involvement was a significant factor in the defense realizing that this was a case that they didn't want to take to trial and certainly was a case that they were looking to try and get the best possible deal for their client."
On April 24, Jason Henry was sentenced to 20 years in prison.
He chose to say nothing at the sentencing, and to this day, he has never fully explained why he poured gasoline around his parents' bed and burned their home to the ground.