The penalty phase to determine whether convicted killer Jodi Arias will face life in prison or the death has been postponed.

Back in May 2013, Arias was found guilty of the first-degree murder of her ex-boyfriend Travis Alexander, who was killed in his Phoenix home in 2008. According to medical examiners, Arias stabbed him 27 times, primarily in the back, torso and heart. She also slit Alexander's throat from ear to ear, nearly decapitating him, and shot him in the face before she dragged his bloodied corpse to the shower.

Although Arias was convicted of murder, the jurors failed to reach a unanimous decision on her sentencing. As a result, her retrial will begin next month to determine whether or not she should be sentenced to death, life in prison or life with a chance of release after serving 25 years, Reuters reported.

Arias' retrial was originally set for Sept. 8, however on Wednesday Maricopa County Superior Court Judge Sherry Stephens granted Arias her request to delay it, pushing back the start of jury selection to Sept. 29, said a court spokeswoman, according to Reuters.

Arias, who has decided to act as her own attorney in the upcoming trial, petitioned the court to postpone the retrial because she said she ran into obstacles while trying to interview an expert witness from her prison cell.

Earlier this week, Judge Stephens denied Arias' defense attorney, Kirk Nurmi, his request to resign from her death penalty trial.

Nurmi, who has made several motions to drop Arias due to their ongoing tension, filed a recent motion asking the judge to let him resign from the case since Arias will be her own legal rep, while he was assigned to be her legal advisor. He also cited his original attempt to withdraw and Arias' repeated efforts to have him fired.

However, on Monday, Judge Stephen decided not to let Nurmi withdraw from the case.

According to the Associated Press, a hearing in the case is scheduled for Sept. 4.