A Manassas woman has pleaded guilty to killing her 13-year-old adopted daughter.

Alfreedia Gregg-Glover pleaded guilty Monday in Prince William County Circuit Court to felony murder, felony child abuse and filing a false police report.

Police say Gregg-Glover lied when she told them her daughter Alexis "Lexie" Agyepong-Glover had run away in January. A massive search ensued, and two days later the girl's body was found in a Woodbridge creek.

The county's social services agency fired one senior social worker and disciplined two others for mishandling the case. An internal review found that several employees did not follow proper procedures in response to abuse and neglect reports about the child.

Gregg-Glover's sentencing is set for October 2.