( CNN ) -- Shiping Bao , the medical examiner who changed his mind on crucial aspects during his testimony at George Zimmerman 's trial , has been fired . But he 's not going down without a fight . Bao has hired a lawyer and is hinting at a lawsuit . Bao was let go from his job as the associate medical examiner for the Volusia County , Florida , Medical Examiner 's Office last week , officials said Wednesday . Authorities provided a copy of his termination letter , but did not specify a reason . The letter says Bao was given a choice to resign . He did n't . So , he was terminated Friday . Bao 's lawyer filed a complaint against the county , CNN affiliate Central Florida News 13 reported . The letter reads in part : . `` This is a formal request to ask you to preserve any and all documents ... and/or evidence related to Dr. Bao 's claims and/or the Trayvon Martin Case . '' Bao performed Trayvon Martin 's autopsy after Zimmerman shot dead the 17-year-old on February 26 , 2012 . During Zimmerman 's trial , Bao 's testimony stood out . He changed his mind on important aspects of the case , such as how long Martin survived after he was shot , whether he could have moved afterward and if the marijuana in his system affected his judgment . Bao 's attorney , Willie E. Gary , said he plans to file a lawsuit for discrimination , job harassment and wrongful termination , the Miami Herald reported . George Zimmerman wo n't be charged for alleged domestic incident .
Shiping Bao performed an autopsy on Trayvon Martin . The medical examiner said the teen was shot in a "homicidal manner" and that Zimmerman had acted with malice toward Martin. Authorities said Bao was fired on Friday .