"Isn't it true that Mr. Alexander was extremely fearful of the defendant based on what was said in that conversation?" Martinez asked.
"I don't get that," LaViolette replied.
"You're taking what's in this instant message and you're picking and choosing what to believe and what not to believe, right? Martinez prodded.
"No," LaViolette said.
The two traded barbs as LaViolette accused the prosecutor of mischaracterizing her work. She explained that while Alexander may have made such comments about Arias being a stalker, his behavior toward her — continuing to court her and invite her to his home for sex — painted a different picture.
"He is extremely afraid of her," Martinez said. "You chose not to believe that?"
LaViolette said she did not believe that assessment "based on his behavior toward Ms. Arias."
Martinez later seized on the multiple lies Arias told authorities in the days and even years after the killing.
"She does have a history of lying, doesn't she?" he asked.
"After the killing, yes," LaViolette said.
After continued prodding, LaViolette acknowledged she has no way of knowing whether Arias is telling the truth now.
Martinez then returned to a familiar accusation of bias, one he used on a previous defense witness who diagnosed Arias with post-traumatic stress disorder and amnesia. Martinez at the time accused psychologist Richard Samuels of forming a relationship with the defendant that biased his diagnosis. Samuels denied the accusations.
He leveled a similar claim against LaViolette on Monday.
"In this case, you actually are biased in terms of the defendant, aren't you?" Martinez asked, noting how LaViolette apologized to Arias during their first meeting for having gone through her journals and other private materials.
"Do I believe the evidence supports domestic violence? Yes," LaViolette replied. "I don't believe I'm biased."
The day ended with a perplexing detail that hadn't yet been explained as Martinez questioned LaViolette about a "manifesto" Arias has written.
Martinez questioned her about Arias having signed the work "in case she became famous."
Testimony was set to resume Tuesday.