"I just want to show you,'" Loughner replied.
Loughner then left Heintz with a souvenir — one bullet.
His parents grew alarmed over his behavior on several occasions — at one point submitting him to drug-testing. The results were negative, said Amy Loughner, who was particularly worried that her son might have been using methamphetamine.
The father said his son kept journals, but they were written in an indecipherable script. Loughner bought a 12-gauge shotgun in 2008, but his parents took it away from him after he was expelled from college and administrators recommended he not own weapons.
On the day of the shooting, he and his father got in an argument, and he chased Jared Loughner away from their house. Friend Bryce Tierney told investigators Loughner called him early in the morning that day and left a cryptic voice mail that he believed was suicidal.
"He just said, 'Hey, this is Jared. Um, we had some good times together. Uh, see you later.' And that's it," Tierney said.
Onetime Loughner friend Zachary Osler explained how he worked at a sporting goods store where Loughner bought the handgun used in the shooting. He was questioned about seeing Loughner shopping there sometime before Thanksgiving and described an awkward encounter with the man.
"His response is nothing. Just a mute facial expression. And just like he, he didn't care," Osler told authorities.
News organizations seeking the records were denied access in the months after the shooting and the arrest of Loughner, who was sentenced in November to seven consecutive life sentences, plus 140 years, after he pleaded guilty to 19 federal charges.
Last month, U.S. District Judge Larry Burns cleared the way for the release of the records after Star Publishing Company, which publishes the Arizona Daily Star in Tucson, joined by Phoenix Newspapers Inc., which publishes The Arizona Republic, and KPNX-TV, sought their release. The judge said Loughner's fair-trial rights were no longer on the line now that his criminal case has resolved.