Jurors went home Wednesday without delivering a verdict.
Earlier this week, Arias' attorneys said jurors were at an impasse, but the judge denied a mistrial request.
Arias was convicted of murder in 2013 after a lengthy trial that became a sensation with its tawdry revelations about her relationship with victim Travis Alexander.
That jury deadlocked on her punishment.
If the case's current jury can't decide on a sentence, the death penalty would be removed as an option and the judge would decide if Arias serves life in prison or gets a chance for release after 25 years.
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