(CNN) -- The attorney for George Zimmerman plans to ask a judge as early as Thursday to allow the neighborhood watch volunteer charged with killing an unarmed, black teen to post bond -- though he believes it will be difficult.
"My hope is that the judge will grant a bond, and that it'll be a bond that the family can make," attorney Mark O'Mara said Wednesday. "They are not a family of means. So that's going to be difficult to begin with, and that conditions are that you stay local, I think that may be difficult."
"I think nobody would deny the fact if George Zimmerman is walking down the street today he would be at risk," he said.
Zimmerman, 28, who had been in hiding, turned himself in Wednesday after authorities said they will charge him with second-degree murder in the February 26 shooting death of 17-year-old Trayvon Martin.
The charge against Zimmerman marks a turning point in a case that triggered a nationwide debate about race in America and about Florida's "stand your ground" law -- which allows people to use deadly force anywhere they feel a reasonable threat of death or serious injury.
O'Mara said Zimmerman, who will plead not guilty, is worried about getting a fair trial in Sanford -- where thousands have converged to join in protests calling for his arrest and decrying the police department's handling of the case.
"We simply wanted an arrest; we wanted nothing more, nothing less," said Martin's mother, Sybrina Fulton, after the charge was announced.
Charge amid a see-saw of allegations
Forty-six days after the shooting, a special prosecutor assigned to the case announced the charge against Zimmerman on Wednesday. During that time, the calls for "Justice for Trayvon" had grown louder and louder, with Martin's supporters taking to the streets and to the web.
"Let me emphasize that we do not prosecute by pressure or petition. We prosecute cases based on the relevant fact of each case and on the laws of the state of Florida," said Prosecutor Angela Corey, who has a reputation for taking on tough, controversial cases in the three counties that make up the 4th Judicial Circuit.
Corey said whether the case is decided by a judge or jury, "I can assure they will only get the relevant, admissible evidence on which can then base their decisions."
Prosecutors usually level a second-degree murder charge when they accuse someone of a killing that is not premeditated or planned. It carries a maximum sentence of life in prison.
In severity, the charge falls between first-degree -- when a person is accused of killing someone deliberately -- and manslaughter, when an act results in an unintended death.
Corey did little to put to rest questions that have swirled around what happened the night Martin was killed in the suburban Orlando community. Witnesses and attorneys for both sides have offered conflicting accounts.
What is known is that Martin, wearing a hoodie, ventured out from his father's fiancee's home in Sanford to get a snack at a nearby convenience store. As he walked home with a bag of Skittles and an Arizona iced tea, he was shot and killed by Zimmerman.
Sanford police questioned Zimmerman and released him without charges.
From there, the case has evolved into see-saw allegations by Zimmerman's supporters, Martin's family and authorities.
Zimmerman says he killed Martin in self-defense after the teen punched him and slammed his head on the sidewalk, according to an Orlando Sentinel report that was later confirmed by Sanford police.
One of the responding officers saw a wound on the back of Zimmerman's head and a bloody nose, and noted that his back was wet -- indicating he had been lying in the grass, according to the police report.
An enhanced copy of a surveillance video showing him in police custody after the shooting appears to show a bump, mark or injury on his head.
Martin's family and supporters have dismissed the video.
They say Zimmerman, who is Hispanic, racially profiled the teen, who was black, and ignored a police dispatcher's directive not to follow him.
Zimmerman's attorneys, who he has since replaced, interpreted the call differently, and say the operator did not order Zimmerman not to follow.
A recording of a 911 call made the night of the shooting captured someone pleading for help. Zimmerman has said he was yelling for help, according to his family members and his account to authorities.
Martin's relatives have said they are certain the voice heard on the 911 call is Martin's.
Audio experts, who analyzed the recordings for the Orlando Sentinel using different techniques, said they don't believe it is Zimmerman.
They compared the screams with Zimmerman's voice, as recorded in a 911 call he made minutes earlier describing a "suspicious" black male.
The debate was further muddied when a witness, who declined to be identified by CNN, said she saw and heard the incident through her window.
When pressed if she could determine who