Two area residents charged in connection with the death of their 4-year-old daughter in Benton County last year have court proceedings scheduled.

The Benton County Sheriff’s Office says on December 20, 2020, authorities were called to a residence in regards to unresponsive Jessica Mast. Authorities were told she had been beaten, submerged in a pond, then left to freeze on the bank before being taken back into the residence, where she later died. The girl’s mother Mary Mast and a 2-year-old male child also had reportedly been beaten to a severe extent.

Some of the charges for each of the four subjects in the case have been amended from original court documents.

On June 1, Mary Mast, of Eldon, waived formal arraignment and pleaded not guilty to felony charges of second-degree murder, abuse or neglect of a child resulting in death, first-degree assault or attempt, two counts of endangering the welfare of a child and three counts of armed criminal action. She posted $500,000 surety bond on February 2.

The deceased girl’s father James Mast, of Lincoln, is charged with second-degree murder, abuse or neglect of a child, first-degree assault or attempt, two counts of endangering the welfare of a child resulting in death and two counts of armed criminal action. He posted $500,000 surety bond on January 20.

Preliminary Hearings for both James and Mary Mast are scheduled for 9 a.m. Wednesday, December 22.

Kourtney Aumen, of Lincoln, who is facing felony charges of second-degree murder, abuse or neglect of a child resulting in death, first-degree assault or attempt, two counts of endangering the welfare of a child and three counts of armed criminal action, pleaded not guilty on April 21. Her case was bound over to the trial division on October 29. Her attorney filed a motion for a change of venue request on December 10. She is being held without bond. Her next hearing is pending.

On June 1, Ethan Mast, of Lincoln, pleaded not guilty to felony charges of first-degree murder, first-degree assault or attempt, abuse or neglect of a child resulting in death, two counts of endangering the welfare of a child and three counts of armed criminal action. He is being held without bond. A plea hearing is scheduled for 1 p.m. Tuesday, January 4, 2022, at Benton County Circuit Court.

Photos of Mary and James Mast courtesy of the Benton County Sheriff’s Office.