According to court documents, a knife was found in the Grant Hayes' vehicle. Defense attorneys claim they just learned about the knife from police. It was discovered in the SUV used in the crime.
In a motion filed by Amanda's attorneys they wrote, "The discovery of a 'knife' inside of the Dodge Durango is important because the defendant's husband, Grant Ruffin Hayes III, threatened to kill the defendant and their children with a 'machete' while they were in Richmond, Texas. The 'machete' was introduced into evidence at the trial of Ruffin Grant Hayes III. It is still in the possession of the State of North Carolina."
Amanda Hayes is charged in the death of Laura Ackerson, She is scheduled to go on trial next month. Her husband, Grant Hayes, who had two children with Ackerson, was convicted in September.
Amanda Hayes pleaded not guilty last month to murder and "accessory after the fact of murder" charges.
During his trial, Grant Hayes blamed Amanda for actually killing Ackerson - saying he only helped dispose of the body.
Hayes - aka Grant Haze - was charged - along with Amanda - with murdering the 27-year-old at their Raleigh apartment in July 2011 during a long-running custody dispute. Prosecutors say they chopped up Ackerson's body, put it in coolers, and then drove them in a rented U-Haul to Amanda Hayes' sister's house in Richmond, Texas, where the body parts were dumped in a creek.
Amanda Hayes' trial is set for Jan. 20.
Grant Hayes is currently serving a life sentence in prison.