Newly released video shows George Zimmerman retracing his steps leading up to the moment he shot and killed Trayvon Martin for Sanford police investigators.

The new files, released late Wednesday night by Zimmerman's legal team, also include Zimmerman's written statement to Sanford police (pdf) that same night.

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One day after shooting and killing Martin, Zimmerman returned to the scene, this time with Sanford police.

As he re-enacted the scene for investigators, Zimmerman said Martin threatened his life, telling him "You're gonna die tonight."

According to Zimmerman's story, he was walking back to his vehicle, when the teen jumped out of the bushes and asked him what his problem was.

Zimmerman told police he answered, "I don't have a problem." That, according to Zimmerman, was when Martin attacked him, hitting him in the face as he screamed "help me" at least 50 times.

"And then I tried squirming again, because all I could think about was I felt my head was going to explode, and I thought I would lose consciousness," said Zimmerman. "So I tried to squirm off the concrete, and when I did that, someone here opened the door, and I said 'Help me,' and they said, 'I'll call 911.' But I said, 'No, help me. I need help.' That's when my jacket moved up, and I had my firearm on my right hip."

"My jacket moved up, he looked at it and said, 'You're going to die tonight, [expletive],'" Zimmerman said. "And he reached for it, but I felt his arm going down to my side, and I grabbed it and shot him one time."

Police then asked Zimmerman what Martin said after he shot the teen.

"I shot him, and I didn't think I hit him, because he sat up and said 'You got me,' 'You got it,' something like that," Zimmerman recalled.

Along with the re-enactment of the events according to Zimmerman, he also took and passed a stress test.

Our legal analysts said there are two important things to consider in examining Zimmerman's story: Provocation and escalation.

Zimmerman said he was going back to his car, when Martin came out of the bushes.

As far what escalated the situation, Zimmerman claimed Martin put his hand over his month, and he believed the teen was reaching for his gun.

So what does that mean for the case? If Judge Kenneth Lester believes Zimmerman's account, then under a "Stand Your Ground" defense, he would walk.

As to whether his story is believable, it's the prosecution's job to prove it's not.

Zimmerman had already called 911 after spotting the teen in the neighborhood. Police said Martin was staying at his father's girlfriend's home in the Retreat at Twin Lakes community in Sanford. The teen was walking back to the home after going to a nearby convenience store.

Martin was reported missing by his father, Tracy Martin, the next morning.

During the 3-minute call, he gave the dispatcher identifying information about his son. A few minutes later, the dispatcher called back to get more information about the teen and told Martin an officer was on his way for an interview.

Officials released a transcript of the 911 call Wednesday.

Also Wednesday, Sanford City Manager Norton Bonaparte fired police Chief Bill Lee, who had been criticized for his department's initial investigation into the shooting.

Zimmerman has been charged with second-degree murder in the shooting. He claims he shot the teen in self-defense, under Florida's "Stand Your Ground" law.

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List of released evidence

VIEW: Notice of Reciprocal Discovery (pdf)