According to the warrant, "... It was determined that prior to her death, Laura Ackerson received a message from Grant Haze to visit the children at his residence on the evening of July 13, 2011."
Investigators found conversations between Ackerson and Hayes after searching various email accounts. In the warrant made publice Monday, investigators say they're looking for "any other e-mails that may reveal planning or motivation for the murder of Laura Ackerson."
Ackerson's remains were found in Oyster Creek near Skinner Lane in Richmond in July. Identification was made through dental records days later. The 27-year-old was reported missing on July 18.
Raleigh police arrested and charged the father of Ackerson's two sons, 32-year-old Grant Ruffin Hayes, and his wife, 39-year-old Amanda Perry Hayes with murder in connection with Ackerson's death.
Texas deputies said they believed Ackerson was killed in North Carolina, and then dismembered, before her body was taken to Texas in coolers. The creek where the remains were found is near Amanda Hayes's sister's home.
Ackerson and Hayes had been involved in a custody battle over their children for more than a year. Hayes was granted primary custody in 2010.
Grant Hayes is a local musician in Raleigh, who is known by the stage name, Grant Haze - which the warrants note.