Jodi Arias trial live: Arias sobs when prosecutor asks about killing Travis Alexander

PHOENIX - Jodi Arias sobbed during much of Thursday's court proceedings as the case's lead prosecutor hammered her with questions about the day she killed Travis Alexander.

Arias first began crying just before court went to recess, as prosecutor Juan Martinez showed her a photo and asked about killing her former boyfriend.

The 32-year-old is charged with killing Alexander in June 2008 at his Mesa, Ariz. home.

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Throughout her testimony Thursday morning, Martinez repeated his questions several times as he battled with Arias in getting the truth.

"I'm asking 'yes' or 'no'," he repeated.

Martinez eventually showed some frustration and got back to the basics.

"You remember we're talking about Travis Alexander, right?" he asked. "Because you killed him, right?"

"Yes," Arias said.

Just as it approached the noon hour, Martinez showed Arias a photo of Alexander's body after he had been killed.

When asked to point out where this incident happened, Arias started crying.

"Were you crying when you were shooting him?" he asked. "Were you crying when you were stabbing him? How about when you slit his throat. Were you crying then?"

Arias sobbed and said she didn't know.

Following the court's hour-and-a-half lunch break, Arias returned to the stand to face more of Martinez's questions.

As Martinez on Thursday afternoon pressed Arias to confirm she was the person who shot, stabbed and slit Alexander's throat, she began to cry for a second time.

Toward the end of the day's proceedings, Arias sobbed for a third time when Martinez asked her to read from an email she had sent to Alexander after his death.

Police say Alexander was shot in the head, stabbed 27 times, and his throat was slit.

Arias initially told authorities she had nothing to do with the death.

She is now saying she killed him in self-defense.

Thursday is Arias' 12th day on the witness stand.