A Fort Lewis soldier killed two other soldiers — a married couple — and poured acid on their bodies in an attempt to dispose of them, a prosecutor said Monday.

Spc. Ivette Gonzalez Davila, 22, was ordered held without bond for investigation of aggravated first-degree murder as well as kidnapping. She was accused of taking the couple's 6-month-old girl.

Davila appeared in Pierce County Superior Court shackled in an orange jail jumpsuit, and said only "yes, sir" and "no, sir" to questions posed by Judge Ronald Culpepper.

Michael Kawamura, the county's chief public defender, argued unsuccessfully that the news media should not photograph his client in court, but he offered no other comment during the brief hearing, The News Tribune reported.

Deputy Pierce County Prosecutor Ed Murphy wrote in a court declaration that Davila showed up at her barracks on Sunday afternoon with the baby and initially told a fellow soldier that she was baby-sitting. Eventually, she confessed to the soldier that she had killed the baby's parents the night before, Murphy wrote.

The soldier reported what Davila had said to military police, who arrested her and turned her over to Pierce County authorities.

The victims were identified as Timothy Miller, 27, and Randi Miller, 25. Timothy Miller was apparently shot in a bathtub at the couple's suburban Parkland home, while Randi Miller was shot on a bed and then moved to the bathtub, Murphy wrote.

According to the declaration, Davila took the baby to a home-improvement store after the killings, bought muriatic acid, returned to the home and poured it on the bodies.

The baby was not harmed and is now in the care of the state's Child Protective Services.

Davila told the soldier that "Randi Miller was in a relationship with Davila's ex-boyfriend," Murphy said in his declaration.

Murphy said investigators had found a Home Depot receipt for the acid, a pistol and Randi Miller's purse in a search of the barracks.