A critical hearing for the defense in the Jodi Arias trial was canceled Friday due to a personal matter involving one of the attorneys, HLN has learned.
During the hearing, Judge Sherry Stephens was expected to decide whether the jury will hear what could be significant testimony from defense expert forensic psychologist Richard Samuels.
The hearing has been rescheduled for Monday at 1:15 ET.
Read more: Does Arias suffer from PTSD?
The defense wants Samuels to testify about crime research that demonstrates the differences between premeditated murder crimes and heat-of-passion crime scenes. Samuels is expected to say the chaotic nature of the crime scene indicates it was a heat-of-passion crime that happened in the spur of the moment.
On Thursday, Samuels rocked the courtroom by testifying that Arias suffered post-traumatic stress disorder (PTSD), which could explain much of her actions in the days after her ex-boyfriend Travis Alexander was killed, as well as her memory lapses.
"We call it denial. It’s a very intense form of denial where a person cannot deal with the fact that something they did was so opposite of everything else they stood for in life. I determined that by reading her diaries. And in her diaries, she is essentially a pacifist, not a violent word, not a negative word,” Samuels said.
Watch: Expert: Gun Jodi used jammed
Prosecutor Juan Martinez is objecting to the testimony because Samuels will have to define the differences between premeditated murder and heat of passion murder, and it may confuse the jury. At the end of the trial, the jury will be given strict legal definitions for premeditated murder and other lesser included crimes. Martinez said Thursday that Samuels can't be allowed to muddle the jury's understanding of these terms with his own definitions.