George Zimmerman is in the Seminole County Jail, charged with second-degree murder in Trayvon Martin's death.
During a news conference Thursday evening, State Attorney Angela Corey confirmed Zimmerman turned himself in.
Corey said her team did not come to the decision to file charges lightly, and will continue to seek the truth in this case.
Meanwhile, Zimmerman's new attorney is Mark O'Mara, an Orlando lawyer.
O'Mara said the family contacted him, saying they were referred to him by other lawyers. He then talked to Zimmerman. O'Mara said he did not contact Zimmerman personally, because that would be unethical.
"He's [George Zimmerman's] concerned about getting a fair trial and a fair presentation," O'Mara said of Zimmerman Wednesday.
O'Mara said he is already certain that they will try to get the case moved out of Seminole County, if not Central Florida.
O'Mara told reporter Margaret Kavanagh that Zimmerman will make his first appearance in front of a Seminole County judge Thursday morning. He also said he expected Zimmerman to be put into protective custody for his safety.
Trayvon Martin's family responded to the news Wednesday in Washington, DC.
"We simply wanted an arrest," Sybrina Fulton, Trayvon Martin's mother said. "We wanted nothing more nothing less, and we got it. And I just want to say thank you. Thank you Jesus."
Sanford Mayor Jeff Triplett, meanwhile, called for calm in Sanford and across the country.
"The case is in the hands of the justice system, please allow it to the work through the process, and come to a natural conclusion," he said.