Jodi Arias
Jodi Arias faces cross-examination during her murder trial for the death of Travis Alexander. Reuters

The Jodi Arias murder trial intensified on the 12th day of her testimony in Phoenix Monday.

Prosecutor Juan Martinez nearly berated the 32-year-old photographer her last time on the stand, asking if she had memory problems and yelling at the accused murderer.

Arias is facing first-degree murder charges for killing her ex-boyfriend Travis Alexander on June 4, 2008. She claims self-defense. If convicted she could face the death penalty.

"Ma'am, you have a problem with telling the truth don't you?" Martinez asked as his first question on Monday.

"Not typically," Arias responded.

While he attacked Arias for her shoddy memory the first day, on Monday he painted her as a liar. She first told Detective Esteban Flores of the Mesa, Ariz., police department that she wasn’t in Alexander’s home after he was killed. She later changed her story and said masked intruders murdered her former lover before ultimately saying that she killed him in self-defense.

"You told (Flores) you would help him, but that was a lie right? You weren't there to tell the truth. You were there for another purpose: to make sure he didn't get the truth. ... You were hoping, ma'am, that (Flores) would believe what you were saying so you could walk out of jail," Martinez said.

Arias argued with the prosecutor, saying the reason she lied to friends, family and authorities was out of “shame” and not guilt or fear of getting caught.

"My mind wasn't right during all that period," Arias claimed.

Right after the killing, she drove out to the Arizona desert and called ex-boyfriend Matthew McCartney and new lover Ryan Burns.

"It's like I wasn't accepting it in my mind ... because I never killed anyone before," she said.

Martinez suggested that Arias worked her way into the investigation so she could find out how much authorities knew about Alexander’s death. The prosecution also claimed that Arias called Alexander’s family, his Mormon bishop and friends to find out what they knew about the case.

"You needed to see what you needed to know to make sure you weren't charged. What purpose would there be for that information other than to benefit you?" Martinez asked. "You called [the bishop] at 3 a.m. You call him and spoke to him because you wanted to get the information about what he knew about the investigation. That was going to help you."

The prosecutor continued to go over the lies that Arias told and about how she talked about Alexander as if he were still alive when meeting with friend Leslie Udy and Burns in Utah.

He added that she made out with Burns during their visit, but Arias is saying Burns is the liar here.

"And with Mr. Burns, didn't you get on top of him and grind on him?" Martinez asked.

She admitted to being on top, but said they did not “grind.”

"Well, when you were romantic kissing, he did put his hand between your legs, didn't he?" referring to Burns’ testimony in court weeks before her cross-examination.

"No," Arias said. "It could be that he's full of crap ... when he says he got near my vaginal area."

"This is the person who lied to him, to (friends), to Detective Flores, and yet you're telling us someone else is full of crap," Martinez asked.

"When it comes to that, yes," she said.