Zimmerman Goes Back Into Hiding George Zimmerman, wearing a bullet proof vest, walked out of a Florida jail shortly after midnight today and slipped back into hiding where his lawyer says he will likely stay until his trial next year. Zimmerman was able to leave jail after posting $150,000 bond as he awaits trial on a second degree murder charge for the shooting death of 17-year-old Trayvon Martin. Later today, Sanford Police Chief Bill Lee will officially resign, ABC News has learned exclusively. Lee, who had been "temporarily suspended" last month in the wake of the killing, is expected to make it official at 4 p.m. Zimmerman left the John E. Polk Correctional Facility at the Seminole County Sheriff's Office accompanied by a man ABC News identified as his bail bondsman. Zimmerman was fitted with an electronic monitoring device prior to release, according to a statement from the sheriff's office. The GPS device, which can give immediate identification of an offender's whereabouts anywhere in the U.S., suggests that the defense's request that he be allowed to wait out the trial out of Florida may have been granted. The terms of his release require him to report his whereabouts every three days, according to court documents. Zimmerman was also wearing the bullet proof vest beneath a jacket when he walked out of jail. He wore one in court beneath a dark suit last week. "We have had serious threats that law enforcement is looking into where they've threatened his life and since we don't know how legitimate they are we have to be concerned about all of them," Zimmerman's lawyer Mark O'Mara told ABC News. Out of concern for his safety, OMara says that he will waive Zimmerman's appearance at his arraignment May 8. When asked if Zimmerman will be seen in public again anytime soon, O'Mara said, "I don't think so," and addd that Zimmerman may not be seen in public until he testifies. The lawyer depicted a scenario in which Zimmerman, 28, will be largely in isolation with people monitoring his security. "One picture on a cell phone could destroy the security that we're trying to set up," O'Mara said. He said that Zimmerman will require "somebody who can help protect him" and said he will ask the state to pay for the protection. O'Mara said Zimmerman's family is "hoping to get some assistance from the outside because it's going to be a very expensive proposition" to handle living expenses as well as the cost of security and legal fees. At a bond hearing on Friday Judge Kenneth Lester set bail at $150,000. Zimmerman stunned a Florida court Friday by taking the stand and apologizing to the parents of Trayvon Martin, who were sitting in the courtroom during Zimmerman's bond hearing. Click here to see more images of Zimmerman.