A woman charged in the stabbing and shooting death of her lover in Arizona has told jurors she once awoke to find the victim having sex with her.

Jodi Arias, who returned to the stand Monday, faces the death penalty if convicted of first-degree murder in the killing of Travis Alexander after a day of sex and photographs in June 2008.

Arias testified last week in Phoenix about the volatile relationship that culminated with Alexander's death. Prosecutors claim Arias killed him in a rage, stabbing and slashing him 27 times, slitting his throat and shooting him in the head.

Arias says it was self-defense after initially telling authorities she wasn't there. She then blamed it on masked intruders. She claims Alexander attacked her, forcing her to fight for her life.