Tuesday marks a pivotal day in the ongoing investigation into Trayvon Martin's death.

That's when a group of citizens will make up a grand jury tasked with looking at all the evidence and deciding if that's enough to arrest George Zimmerman, the neighborhood watch volunteer who shot the 17-year-old in late February.

A lot of what happens in a grand jury is confidential, so it's not certain when the public will learn what the grand jury decides.

The special prosecutor appointed to lead the investigation, Florida state attorney Angela Corey, can release the grand jury's basic conclusion. But for the most part, the details about what witnesses had to say or the evidence presented to the grand jury will all be kept secret.

Already, there has been buzz on social media encouraging people to wear hoodies and show up at the Seminole County Courthouse Tuesday to show their support for Trayvon Martin.

The courthouse has begun preparing for possible protests. Officials said protesters and demonstrators will not be permitted within 100 feet from the courthouse's front doors on days when the grand jury meets.

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After 3-day march, students vow to rally again

Dozens of college students spent their Easter weekend marching 40 miles from Daytona Beach to Sanford over three days for Trayvon Martin.

Now, that group expected to gather again Monday morning at Allen Chapel African Methodist Episcopal Church, in Sanford.

The students, who call themselves "Dream Defenders," said they will soak their feet and march again, this time heading to the Sanford Police Department headquarters to pray outside the building.

Organizers said the Trayvon martin case has brought up race issues happening across America. They said the Easter weekend march was to encourage young people to talk about the case and their own feelings about what happened.

"This movement doesn't hinge on George Zimmerman or the Trayvon Martin case. It was a catalyst," said Phillip Agnew, who participated in the three-day march. "It awoke, or woke up a lot of people to what's going on in America."

The students met with some Sanford city leaders Sunday night. Mayor Jeff Triplett has said the city is taking a look at all its departments, adding a lot of healing needs to happen in Sanford.