The neighborhood watch volunteer charged with the shooting death of 17-year-old Trayvon Martin has been released from a Florida jail after posting bail.

George Zimmerman left the facility around midnight Sunday, staring straight ahead as he walked past a group of photographers and into a waiting car. His destination is being kept secret as he awaits trial, but he will wear an electronic monitoring device.

A judge set Zimmerman's bail at $150,000 Friday, and said he must observe a curfew and cannot have any firearms.

The 28-year-old Zimmerman has been charged with second-degree murder in the February 26 shooting. He admitted to killing Martin, but says the teenager attacked him and that the shooting was in self-defense.

Prosecutors say Zimmerman, a white Hispanic man, racially profiled Martin, an African-American, as a potential criminal and confronted the teen. Martin was unarmed and walking back from a convenience store.

Zimmerman apologized to the teen's parents during Friday's hearing, saying he did not know if Martin was armed.

The case sparked nationwide protests over racial profiling and Florida's so-called “Stand Your Ground” law, which allows people to use deadly force if they feel their life is in danger or they are at risk of serious injury.

Police did not initially arrest Zimmerman after the shooting because of his claims of self-defense.