A third juror has been dismissed in the Jodi Arias murder trial in Phoenix.

The juror's dismissal Thursday leaves 15 people on the jury panel to decide Arias' fate. No reason for the dismissal was immediately announced.

Arias faces a potential death sentence if convicted of first-degree murder in the June 2008 killing of her one-time boyfriend Travis Alexander at his suburban Phoenix home.

In the final prosecution testimony of the case, a medical examiner testified Thursday about Alexander's wounds. Dr. Kevin Horn says a gunshot injury through Alexander's brain would have rendered him unconscious and unable to defend himself.

Alexander was shot and stabbed.

Arias wept during part of Horn's testimony.

The trial resumes Wednesday with a last defense witness. Closing arguments are scheduled after that. The case will then go the jury.