Arias's attorneys have tried to prove the killing was not premeditated, but Martinez drove home his allegation again and again during his closing remarks. At one point he focused on evidence that she brought extra gasoline and gas cans on her trip from her home in California to Arizona so she would not have to stop and use her credit card near Alexander's home.
He noted that she dyed her hair shortly before the trip, rented a car and that the license plate was upside down, which he said were attempts to avoid being tracked.
Arias claimed during her own testimony that the June 4, 2008, trip to Arizona was spontaneous, a claim Martinez dismissed.
"She knew. She absolutely knew and had already planned that she was going to kill him," Martinez thundered.
The prosecutor, who often shouted at witnesses and grew irritated and combative during questioning, was soft spoken to the jury throughout his statement, his voice rising only occasionally.
Arias shook her head and at times smiled in disagreement with many of Martinez's statement, writing notes to her attorney seated next to her.
Relatives and friends of Alexander filled the courtroom's gallery today, taking three rows, while Arias's mother, aunt, grandmother, and friends filled her side of the room. Many of the relatives have sat through four months of testimony in the case.