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OVERLAND PARK, Kan. -- It was bad enough when 18-year-old Mikayla Norris didn’t show up for work Monday at Jack Stack Barbecue in Overland Park, but police say new developments today give them more reason to worry.

The Overland Park Police Department is seeking the public's assistance in locating Mikayala L. Norris, 5-foot-3 in height, 185 lbs, blonde hair and blue eyes. Mikayala was last seen wearing a black shirt and black pants.

Mikayla was last seen on Dec. 17 around 8:30 p.m. at Jack Stack Barbecue in Overland Park. Norris took a job as a hostess after moving to the metro from Fort Scott, Kansas.

She hasn’t been seen since leaving work Sunday night. A flyer from Kansas Missing and Unsolved said she was believed to be going to a party in Independence and her last text said she was hanging out with friends.

Mikayla was last seen in a 2007 black four door Toyota Camry bearing a Kansas licenses tag of 566 FSB.

But later, an unknown man was spotted driving her car.

After seeing reports about the missing woman's car, a witness took pictures of the the man filling up the gas tank at a Gladstone QT.

But the witness quickly figured out it wasn’t Norris filling up her car at the Gladstone QuikTrip, and the man didn’t seem happy about her trying to see if anyone else was in the car.

"In the process of doing that, the person who was driving the vehicle at the time got suspicious and started approaching our witness and acting like maybe he had a gun," Captain James Sutterby with Overland Park Police said.

These surveillance photos show the driver of that car paying for gas with cash. He was in the store for only about 15 seconds. And police say there’s no indication Norris was in the car.

Family tell police she always checks in with them and is posts regularly on social media, but hasn’t now for about 48 hours.

“Somebody who she doesn’t know is in possession of her vehicle and in a place where she normally wouldn’t be at, so there’s several things that causing us a little bit of concern in this case,” Sutterby said.

If you have any information about Mikayala’s whereabouts, or you know the man in the photo, you are urged to contact the Overland Park Police Department at 913-344-8721.