Caleb Cannon is charged with first-degree murder in the 2014 death of Nikki Burgess, the mother of his son. Police previously said they believe money and custody of Cannon and Burgess’ son was the motive. A former cellmate told investigators that Cannon confessed to killing Burgess and taking her body to East Tennessee. Her remains still have not been found. Burgess, 36, has not been seen or heard from since she was reported missing by a friend on May 25, 2014.