George Zimmerman appearing in court April 20th (Getty)
McLean, VA (written by Douglas Stanglin/USA Today) -- A newly released videotape shows George Zimmerman re-enacting for investigators his version of events the night he shot and killed unarmed black teenager Trayvon Martin.
The re-enactment, which was conducted at the scene one day after the Feb. 26 shooting, was among new evidence released by prosecutors in advance of Zimmerman's trial for second-degree murder. Zimmerman, a neighborhood watch volunteer, says he killed Martin in self-defense.
The full tape was made available on the GZlegalcase.com website managed by Zimmerman's defense team.
Portions were broadcast today by reporter Pierre Thomas on ABC's Good Morning America.
In the tape, ABC reports, Zimmerman claims that he was attacked by Martin that night in a gated community in Sanford, Fla.
"He took my head and slammed it against the concrete several times, and each time I thought my head was going to explode and I thought I was going to lose consciousness," George Zimmerman tells police in the tape, according to ABC News.
He says he "started screaming for help," but that Martin pressed his hands over Zimmerman's mouth and nose and told him to shut up.
"I didn't want him to keep slamming my head on the concrete so I kind of shifted. But when I shifted my jacket came up ... and it exposed my firearm. That's when he said you are going to die tonight. He took one hand off my mouth, and slid it down my chest. I took my gun aimed it at him and fired."