A Seminole County grand jury will hear the Trayvon Martin case in April. The teen's shooting death by a neighborhood watch volunteer in February has sparked a national outcry that has grown louder in recent days.
"I share in the desire of the family and the community to accurately collect and evaluate all the facts surrounding the tragic death of Trayvon Martin," State Attorney Norm Wolfinger said in a news release.
The grand jury will convene on April 10.
Martin, 17, was walking to his father's fiancee's home in Sanford on February 26 when he was approached by George Zimmerman, a self-appointed neighborhood watch member.
Moments later, Zimmerman shot the teen, who was returning from a convenience store with candy and a can of tea. He was unarmed.
Zimmerman told police he fired in self defense and has not been charged. Investigators said they had no evidence to challenge his story.
In another development, ABC News reports that just seconds before he was shot to death, Martin was on his cell phone talking with a 16-year-old girl.
In an exclusive interview, the girl, whose parents did not want her identified, said Martin told her someone was watching him and that he was trying to get away from the person.
"He said this man was watching him. So he put his hoodie on. 'What are you following me for?' The man said 'what you doing around here? Then the man like, like pushed Trayvon cause his headset like fell," the girl said.
After the phone went dead, the girl tried to call back, but here was no answer.
In 911 recordings released last week, Zimmerman is heard on the phone with a dispatch operator just before the shooting. Zimmerman said he was following the teen.
"Something's wrong with him. Yep. He's coming to check me out," Zimmerman told the dispatcher. "He's got something in his hands. I don't know what his deal is. Send officers over here."
When Zimmerman said he was following the boy, the dispatcher told him, "We don't need you to do that."
A few minutes later, someone who lives near the scene of the shooting called 911 to report a disturbance. In the background, screams for help could be heard.
Trayvon's father said he believed the pleas for help were his son's last words.
A voice analysis will be conducted in an effort to determine who was yelling for help.
Late Monday, Federal prosecutors and the FBI announced they will investigate the shooting.
Earlier Monday, Governor Rick Scott said the case has "caused significant concern within the Sanford community and the state" and asked the Florida Department of Law Enforcement to assist.
CNN contributed to this report