Conclusion: Yes
1) She made the killing out to look like self defense.
2) She rented a car and drove from Redding, CA to Arizona with cans of gas in her car so she wouldn't leave a trail coming to Arizona.
3) She hooked up afterwards with an out of state love interest so she could have an alibi. Defense Conclusion: No
1) Arias was the victim of a psychologically abusive relationship.
2) She used self defense after Alexander became violent after she broke his camera.
3)Arias wouldn't have gone to a place to pick up a car with lots of cameras and security around.
4) Arias could have just used money for gas to cover up her trail instead of using cans.
My conclusion: Yes, she killed him