sentence, could have forgotten stabbing her boyfriend, travis alexander, almost 30 times, leaving behind this incredibly bloody skricrime scene. samuels testified that he thinks arias suffers from ptsd. she remembers the beginning of the attack and the end of the attack. reporter: but the rest of it arias claims she can t member. do you have any memories of slashing mr. alexander s throat? no. reporter: prosecutor martinez went to great lengths trying to discredit samuels, peppering him about his inconsistencies in his report and openly questioning the quality of his work. how much are you getting paid per hour? i get paid per hour $250. and for $250 an hour, you re saying that this is not you weren t paying enough attention to put whatever else i reviewed the report numerous times and i must admit i missed it. reporter: and, carol, no relief for dr. samuels today. he ll be back on the stand.