The state 's chief witness in the Trayvon Martin murder case lied under oath , prosecutors say . The young woman who says she was on the phone with Martin when he encountered George Zimmerman lied about her whereabouts at another time , the prosecution told a judge Tuesday . The woman , whose name has not been released , had told prosecutors that she was in the hospital on the day of Martin 's funeral . The defense then sought her medical records . Letters to Zimmerman show split opinions on Trayvon Martin shooting . In court on Tuesday , the state said the woman , known as Civilian Witness 8 , was not in the hospital , so there are no such records to be turned over . Prosecutors did not immediately respond to a question Wednesday from CNN about the witness 's credibility and how this may affect the case . Questions have long surrounded the woman . Martin family attorney Benjamin Crump first played an audio recording of the woman a year ago at a news conference . The recording seemed to have very poor quality . Police said that as of that point they had not interviewed her . Trayvon Martin 's parents ready to let jury decide fate of son 's killer . Crump said the witness was 16 years old . But prosecutors have since said she was already 18 -- legally an adult -- on the night of the killing , February 26 , 2012 , in Sanford , Florida . Martin , 17 , was walking to the house of his father 's fiancee after a trip to a nearby convenience store . Zimmerman , a neighborhood watch volunteer , has acknowledged shooting Martin . Crump has accused Zimmerman of killing Martin `` in cold blood . '' Zimmerman says he acted in self-defense . 5 things to know about the George Zimmerman-Trayvon Martin saga .
The witness lied about being in the hospital during Trayvon Martin 's funeral . Score: 7 Prosecutors have not said how the witness 's credibility may affect the case . Trayvon Martin , 17 , was killed Feb. 26 , 2012 .