A decision whether to allow voice-recognition experts to testify at George Zimmerman's trial has been put on hold.
Florida Circuit Judge Debra Nelson stopped today's hearing because an audio expert was stuck at an airport and unable to testify.
Zimmerman has been charged with second degree murder for fatally shooting 17-year-old Trayvon Martin in February last year.
For the past three days, audio experts have been testifying whether screams heard on 911 calls were Martin's voice or Zimmerman's.
Prosecution experts say the screams likely belonged to Martin.
But today, audio experts called by the defense criticized the prosecution's findings.
Audio recognition experts say that it would be the first time to compare screams to a normal voice.
The hearing on whether to allow audio experts to testify has been suspended until sometime next week.
Jury selection in the trial is expected to begin Monday.