Alexander suffered nearly 30 knife wounds, was shot in the forehead and had his throat slit before Arias dragged his body into his shower. He was found by friends about five days later.
Arias said she recalled Alexander attacking her in a fury after a day of sex. She said Alexander came at her "like a linebacker," body-slamming her to the tile floor. She managed to wriggle free and ran into his closet to retrieve a gun he kept on a shelf. She said she fired in self-defense but had no memory of stabbing him.
Arias acknowledged trying to clean the scene of the killing, dumping the gun in the desert and working on an alibi to avoid suspicion. She said she was too scared and ashamed to tell the truth.
As deliberations drag on, dozens of people gather daily on the courthouse steps waiting for a verdict.
If Arias is convicted of first-degree murder, she faces either life in prison or a death sentence. Jurors also have the option of convicting Arias of second-degree murder if they believe she didn't premeditate the killing but still intentionally caused Alexander's death. If convicted of that charge, she could be sentenced to 10 to 22 years in prison.