Expert returns to stand in Jodi Arias murder trial

FILE - In this March 7, 2013 file photo, Jodi Arias answers written questions from the jury in Maricopa County Superior Court in Phoenix during her trial for the 2008 killing of her boyfriend, Travis Alexander. Psychologist Richard Samuels, who diagnosed Arias with post-traumatic stress disorder and amnesia, returns to the witness stand for a sixth day of testimony Monday, March 25, 2013. (AP Photo/The Arizona Republic, Tom Tingle, Pool, File)

PHOENIX (AP) — A defense expert who diagnosed Jodi Arias with post-traumatic stress disorder and amnesia has resumed testifying for a sixth day as the prosecutor continues to question his credibility.

Arias faces a possible death sentence if convicted of first-degree murder in the 2008 killing of Travis Alexander in his suburban Phoenix home. Authorities say she planned the attack on her lover. Arias initially told authorities she had nothing to do with it then blamed it on masked intruders. She later said it was self-defense.

Psychologist Richard Samuels answered more than 100 jurors questions last week, most focused on Arias' lies and how Samuels could be sure she is telling the truth now.

Arizona is one of a few states where jurors can query witnesses through written questions read by the judge.