SPOKANE, Wash. -

One woman is dead and a suspect has been taken into custody for an early morning homicide in Nine Mile Falls Tuesday.

The sheriff's office received a call at 2:42 a.m. from an individual that said a roommate had killed their girlfriend. The dead woman was later found in a plastic tub filled with acid in a detached garage at the residence, located in the 14800 block of Autumn Lane.

It's not yet known how the woman was killed, but detectives say they believe she was killed Monday and then placed in the acid-filled tub.

"When did this murder take place, where did this murder take place, we don't even know if it took place here at this residence, and obviously we want to find out why. Those are all the investigative questions we have right now," Spokane County Sheriff's Deputy Craig Chamberlin said.

Deputies responded in the early morning hours and set up a perimeter and the Spokane Police SWAT Team was called in to assist. The Spokane County Sheriff's Office SWAT team responded later as they were assisting the Washington State Patrol auto theft unit in executing a search warrant earlier in the morning near Newport.

Two elderly people who live at the residence were inside with the murder suspect, identified by the sheriff's office as Jason Hart, 27. They came out of the home and were interviewed by authorities, leaving Hart the only person inside the residence.

The SWAT teams established communications with Hart, who left the residence at 11:58 a.m. and was arrested without incident.

Following Hart's arrest, five SWAT team members were treated for being exposed to some sort of vapor at the home. The sheriff's meth lab team, as well as the Spokane Fire Station #1 HazMat team, responded to the residence to process the meth lab if one was found on the property. No meth lab was found.

Detectives will be back on scene Wednesday morning to really begin the murder investigation. On Tuesday most of their day was spent trying to figure out how to remove the woman's body. At 6:30 p.m. on Tuesday night, her body was removed from the garage. A sample of the acid her body was in was sent to a crime lab.

Hart was booked in the Spokane County Jail late Tuesday afternoon.

The identity of the female victim has not yet been released. An autopsy on the woman is scheduled for Wednesday morning. Once the Medical Examiner completes the autopsy, her identity will be released.