Greg Smith, convicted teen murderer, took pics of great grandparents after killing them

To prove that he wasn't simply making up a story, Smith offered to bring the girl photos of the scene -- and he did. She responded by telling him he needed to contact the police immediately, but he refused, allegedly because he'd touched all the guns in the house and had taken money and his great-grandfather's van. For that reason, he believed the cops would assume he had murdered them.

The driveway leading to the Clagett home.

Unsurprisingly, the officers decided they needed to chat with Smith pronto, so they headed to Swedish hospital in Denver, where he'd been taken after the accident. During the conversation, he insisted that when he'd last seen his great grandparents, several days previous, they'd been perfectly fine -- but when he returned from school that day, they were gone. He reportedly assumed they were "gallivanting" around and had left him to fend for himself.

Another interview with agents followed, and this time, the document maintains, Smith came clean, even though his mother was in the room for part of the conversation.

"I got a hinkling feeling on Sunday night [March 27]," he said -- and when one of the agents asked what had happened to his great grandparents, he replied, "They had gotten shot."

Why?, asked an agent

"Cause I'm gonna pull it off," Smith is quoted as telling him. ""I'm gonna go down and shoot my great grandparents."

The reason he did so, he added, was "kinda just for the hell of it...to see if I could get away with it."

These thoughts went through Smith's head that Sunday, the affidavit relates. He was restless, couldn't sleep, and he started thinking about quarreling with the Clagetts -- "all the bickering, all the fighting." Plus, Charles was "attempting to have Alzheimer's" and Laura "did not know exactly what to do."

The solution, in his view, was to "take them out of the picture." Doing so would mean "no more stressed life on me, no more stressed life for them. I'd be perfectly fine."

The Clagetts' home.

That's when Smith realized, "There's a .22 hunting rifle downstairs in the dogs' room, there's another one in the basement on deer hoofs," plus "one in the kitchen in the utility room." He grabbed the latter, but after putting a round in the chamber, it didn't work. Neither did another gun stored behind the door. He allegedly said the gun was a pump and he was "going to push the pump back up -- and that one got jammed, too."

The problem, Smith told the agents, was the age of the weapon; it was an antique. However, his great grandfather had gotten a .410 shotgun for Christmas. And as a bonus, it was kept behind a curtain in a carpeted room that would muffle his footsteps, so that the Clagetts wouldn't hear him.

Smith told the agents he then shut a door to make "sure the dog wouldn't get out" and started moving toward his final destination, only to have the furnace shut off. Fearful of being discovered (he'd been caught sneaking out of the house before, prompting his great grandparents to leave on a nightlight), he waited until the heat clicked on again -- a delay of twenty minutes, by his estimation.

Next, he put on some gloves, entered his great-grandparents' bedroom and fired two shots where he expected their heads would be.

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