WEST PALM BEACH -- For the first time since he was convicted, Nathaniel Brazill sat down to answer questions about killing his teacher three years ago.

In court, Nathaniel Brazill raised a gun and showed how he shot and killed his 31-year-old teacher, in May 2001.

"That's something that I understand," Brazill says. "That's something that I know that I did."

The image of this baby-faced killer on the stand was disturbing but not as frightening as the event that put him behind bars.

A school security camera caught then 13-year-old Nathaniel Brazill approaching the door of favorite teacher Barry Grunow.

After Grunow refused to let him speak with some girls in class, Nathaniel pulled out a gun and shot the teacher in the face.

"Many people don't believe it was an accident, so I'm not going to try to debate it was an accident," says Brazill.

Prosecutor Mark Scheiner says, "If I point the gun directly at you between the eyes and pull the trigger... I can't fathom how that could be an accident."

Brazill, who is now 17, says he's still disturbed by how the media portrays him.

"Mostly as a killer as a murderer... and I understand that may have been something that I did, but that's not who I am," Brazill claims.

It was a controversial decision to try Brazill as an adult. It resulted in a 28-year jail term, when he was convicted for killing Grunow. He'll serve the entire sentence.

Brazill says, "I read books. I play cards. I go out to the weight room."

Wherever he does go, he goes with an eye toward the future and not the past.

"What am I to do? Dwell on the past and continue to beat myself over the head about it? That may be the way some people choose to do it: ‘I messed up. I did something wrong. I'm nothing. I’m nobody. I'm no good,’ but that's not something that I'm willing to do," says Brazill.

Brazill will remain in a juvenile facility until he's 25 years old. He will then be transferred to an adult prison.