POSTED: Tuesday, March 20, 2012 - 8:00am
UPDATED: Tuesday, March 20, 2012 - 8:04am
NBC NATIONAL NEWS — Students and community members rallied in support of Trayvon Martin and his family at Florida's Seminole County Courthouse Monday morning.
Martin was shot and killed in an altercation with neighborhood watchmen George Zimmerman on February 26th.
Zimmerman called police after spotting Martin as he walked down the street near his father's Sanford home, then disobeyed a 911 operator's instruction not to confront the boy.
Zimmerman told the dispatcher that Martin, who was returning from a trip to a nearby convenience store, was acting suspicious.
"This guy looks like he's up to no good or on drugs or something," Zimmerman tells the dispatcher. "He's a black male. Something's wrong with him. He's coming to check me out."
"Are you following him," the dispatcher replies. "OK, we don't need you to do that."
Zimmerman claims Martin attacked him after being confronted and that he pulled the trigger in self-defense.
On Friday night, investigators released 911 calls made the night of the shooting.
"I can't see him. I don't want to go outside. I don't know what's going on," one caller said.
A voice can be heard screaming in the background of one of the calls.
Zimmerman has said the voice is his, but Martin's family believes it is the cries of their terrified son.
The cries then stopped.