Trayvon Martin's Last Phone Call Triggers Demand for Arrest 'Right Now'

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SANFORD, Fla., March 20, 2012

Nearly half a million people have signed an online petition on change.org urging law enforcement officials to step in and arrest Zimmerman, who violated major parts of the Neighborhood Watch Manual, which states "It should be emphasized to members that they do not possess police powers. And they shall not carry weapons or pursue vehicles."

ABC News; Orange County Jail

Trayvon Martin, 17, was fatally shot by neighborhood watch leader George Zimmerman.

Neighborhood-Watch Shooting: Girlfriend Speaks Watch Video

Trayvon Martin's Alleged Killer: 911 Calls Watch Video

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There are about 22,000 registered watch groups nationwide, and Zimmerman was not part of a registered group, which police were not aware of at the time of Martin's killing, said Chris Tutko, the director of the National Neighborhood Watch program.

Protests have played out in the Florida town all week with a large gathering expected Thursday.

Hear More of the Phone Call With Trayvon Martin's Girlfriend and Martin Family Attorney Benjamin Crump