The 32-year-old is charged in the June 2008 stabbing and shooting death of her lover in his suburban Phoenix home. She claims self-defense, while authorities say she planned the attack on Travis Alexander in a jealous rage. Testimony has been ongoing since early January.
Arias first claimed no knowledge of the killing, then blamed it on masked intruders before eventually settling on self-defense.
She returned to the witness stand Monday morning.
Last week, Arias claimed to recall little from the day of the killing.