OKLAHOMA CITY - A pregnant woman whose three children were killed in an RV fire in Del City has pleaded no contest to the charges against her.

Stephanie Dunham and her husband, Christopher, appeared in an Oklahoma County courtroom Friday morning. Both were charged with nine counts of child neglect and drug possession in the deaths of their three kids.

Stephanie Dunham pleaded no contest and the judge scheduled her sentencing for July 11. She could be sentenced to life in prison.

Christopher Dunham is scheduled to go on trial Monday, May 7. The judge has issued a gag order, so prosecutors and defense attorneys cannot comment on the case.

Christopher, 4, Crystal, 3, and Kaylee, 1, were killed in January 2011 when they were trapped inside a burning RV in the family's backyard. Police determined Stephanie Dunham was not in the RV when the fire started, and that the door to the RV was locked. She also tested positive for methamphetamine at the time of the fire, and drug paraphernalia was found inside the mobile home.

Stephanie Dunham is now pregnant with her fifth child. She gave birth to a fourth child in July 2011, six months after her three children died. That child was placed into protective custody. It's not known how far along she is in her current pregnancy.