A southeast Missouri woman has pleaded guilty to second-degree murder in the 2010 deaths of two elderly couples.

UNION, Mo. (AP) — A southeast Missouri woman has pleaded guilty to second-degree murder in the 2010 deaths of two elderly couples.

The Dexter Daily Statesman reports (http://bit.ly/17ovm5I ) 20-year-old Chantale Youngblood of Doniphan pleaded guilty Tuesday in Franklin County to four counts of second-degree murder.

Youngblood had been scheduled to stand trial July 29 for first-degree murder in the deaths of 77-year-old Loyd Eugene Piatt, 80-year-old Gladys Irene Piatt, 81-year-old Edgar Atkinson and 69-year-old Bonnie Chase.

Youngblood is scheduled to be sentenced Aug. 26.

Youngblood's parents are also serving prison sentences for their roles in the murders. Another defendant, 21-year-old Keith A. Boyles, is charged with four counts of first-degree murder and is awaiting trial.