In March 2011, Cisneros, 24, who was 9-months pregnant with Nelson's baby, was found stabbed to death in a Henrico County parking lot. Authorities said her unborn son died due to lack of oxygen.
Nelson and Cisneros both worked together at the Chipotle on West Broad Street near Staples Mill Road. Neslon was her manager.
Prosecutors said Nelson used a knife from the restaurant to commit the murder, according to CBS 6 reporter Sandra Jones who was in court.
The judge agreed to seal all of the evidence in this case until Nelson's sentencing, Jones said.
A sentencing date has not yet been set.
This is a developing story. Visit WTVR.com and watch CBS 6 News for updates.