Nancy Cooper was reported missing from the couple's Cary home on July 12. Her body was found a few days later in a subdivision under construction. She had been strangled.
Investigators say Brad Cooper told them his wife went jogging and never returned. He has denied any involvement in her death.
A search warrant released to the media Thursday shows investigators believe Cooper was intercepting his wife's email and reading the messages. The warrant says Cary investigators made the discovery while searching a laptop computer Cooper used for work.
Cooper was arrested in October and charged with first-degree murder. Since then, he's been in jail without bond. Friday, bond was set at $2 million.
He could face life in prison if convicted
After the hearing, Nancy Cooper's parents released a statement to the media.
"Donna and I have been through the most difficult five months of our life, shared by our family and friends. It is easy to focus on the negatives of this horrendous experience, but we think it is time to 'light a candle and stop cursing the darkness,'" said Donna and Garry Rentz.