SPOKANE, Wash. -

Court documents show a gun was found in the trunk of a Montana woman found dead outside Spokane this week.

Rita Maze called her family Tuesday night and said she'd been kidnapped from a rest stop near Wolf Creek, Montana and was in the trunk of a car. She also called 911 and spoke to a dispatcher in Helena, Montana who heard a gunshot before the phone went dead.

Investigators used the license plate reader on Interstate 90 to spot Maze's car heading into Washington. They also used technology to track Maze's cell phone to the parking lot of a commercial trucking business near the Spokane International Airport. Investigators broke out the car's window, got into the trunk and found Maze dead inside.

A search warrant return filed in Spokane County Superior Court lists several items found in Maze's car, including her purse with cash inside, two magazines of ammunition and a semi-automatic pistol. The pistol was in the trunk, along with Maze's body.

In the hours after the incident, Lewis and Clark County Sheriff Leo Dutton told reporters Maze had been kidnapped and there was a search for her killer. He also mentioned a person of interest captured on surveillance video and hoped to release the photo later that day.

Thursday, however, a law enforcement source told Kxly4 that reports of that person of interest were false and there was no person of interest at the time. Spokane County Sheriff's officials said there was "no imminent danger" to the public.  The Spokane County Medical Examiner's Office ruled Maze died from a single gunshot wound to the chest; her manner of death, however, was listed as "pending."

The FBI is leading the investigation.