He was stabbed 27 times, his throat was slashed and he was shot in the head twice. Martinez argues it was premeditated murder, an aggravating factor that could carry the death penalty.
Nurmi began the day by going through some of Martinez's claims from cross-examination, giving Arias a chance to explain what appeared to be lies or contradictions.
"Last week you were asked several questions about how you blame everybody else and don't take responsibility for things yourself," Nurmi said. "In terms of admitting certain things, I recall days ago, one of first questions I asked you was whether you killed Travis Alexander. Do you recall your answer?
"Yes," Arias said.
"Your answer was you did kill him and you also told us why you were forced to do that didn't you?" he asked.
"Yes, well, he was trying to kill me, so I was defending myself," she said.
"And did you go to Mr. Alexander's home on June 4 with the intent of killing him? At any point that day did you make the conscious decision, I want to kill Travis Alexander?"
"No," she said. "That was never a thought."
Arias and her attorneys have attempted to prove that the killing was not premeditated, an aggravating factor that could be grounds for the death penalty.
Nurmi also circled back to a hand injury that Arias had said she had suffered when Alexander kicked her in the ribs and in her left hand in January 2008. She claimed that her left ring finger was broken and now permanently crooked from the blow.
Martinez, however, showed a photo of Arias from May 2008 in which the injury is not visible. Arias is shown with her arm casually flung around the shoulder of her sister, with her fingers bent slightly around the girl's shoulder.
Today, Arias admitted that her crooked finger did not look particularly bent in the picture, but then demonstrated on defense attorney Jennifer Wilmott that it appeared that way because of the position of her hand. Arias stepped down from the witness stand and placed her arm around Wilmott as they faced the jury box, posing so the jury could see that Arias' finger did not appear crooked when it hung in the same position now.
Nurmi then gave Arias the chance to explain that though she killed Alexander, she still loved him, even on the day of the attack.
Martinez had previously referenced a loving note Arias wrote in the memorial book at Alexander's funeral, saying that it showed her lack of remorse and her willingness to lie to cover up her alleged crime.
"You finish this note to him by saying, 'I love you.' Did you still feel that same unconditional love?" Nurmi asked.
"Well I still had love for him, yes, and, I was thinking now more in terms of eternity," Arias said.
"Looking at that quote -- I love you -- would that be a true statement on June 3, 2008 (the day before the attack)?" he said.
"Yes," she answered.
"And June 4?"
"And how about today?" Nurmi asked.
"Yes, it's still true," Arias said.