A Fort Lewis soldier shot dead a married couple- both fellow soldiers- and kidnapped the couple’s six-month old daughter, a prosecutor stated on Monday.

After killing the two people, the 22-year old Spc. Ivette Gonzales Davila bought muriatic acid to throw on the bodies for the purpose of disposing of them.

She was detained in the Pierce County Jail on Sunday night and is now investigated for aggravated first-degree murder and kidnapping. Davila, a specialist in the I Corps and a member of the Fort Lewis color guard is due to be charged Wednesday for the two killings. She has not served in Iraq.

According to a statement released by the prosecutors, Davila killed Randi Miller, 25, and her husband, Timothy Miller, 27, on Saturday as she believed Randi and Davila’s ex-boyfriend were having an affair.

Then she took the 6-month-old baby to her barracks. Davila asked a soldier to help her carry some baby items from the car, as she was baby-sitting. Later, Davila told the soldier that she “had killed the baby’s parents the night before,” according to the declaration. 

The baby was not harmed and is now in the custody of Child Protective Services. Timothy Miller’s family is expected to take care of her.

The declaration also describes how Davila came to the couple’s home carrying a gun, shot Randi Miller as she was lying in bed, and then shot Timothy Miller who was taking a shower, the Seattle Times informs.

Then she went to a Home Depot and bought some muriatic acid. She then allegedly returned to the Millers’ home, put Randi Miller’s body in the bathtub along with her husband’s, and poured the acid over their bodies.

According to the court documents, military police have found the murder weapon, the receipt for muriatic acid and Randi Miller’s purse in Davila’s barracks at Fort Lewis.