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Kristin Murphy, Deseret News
Salt Lake City Assistant Police Chief Tim Doubt discusses the search for missing 23-year-old Mackenzie Lueck during a press conference at the Public Safety Building in Salt Lake City on Tuesday, June 25, 2019.

SALT LAKE CITY — It took Mackenzie "Kenzie" Lueck about a half-hour to get off her flight at the Salt Lake City International Airport, collect her luggage and get into a Lyft.

On Tuesday, the Salt Lake City Police Department released still images taken from surveillance video at the airport showing Lueck getting off her plane and making her way through the airport.

Police say they are the last known images of the 23-year-old University of Utah student before she disappeared.

She got off her flight from California about 2:09 a.m. on June 17, according to police. It took about a half-hour for her to get off the plane and make her way to baggage claim. She got into a Lyft about 2:40 a.m., police say.

Kristin Murphy, Deseret News
Salt Lake City Assistant Police Chief Tim Doubt discusses the search for missing 23-year-old Mackenzie Lueck during a press conference at the Public Safety Building in Salt Lake City on Tuesday, June 25, 2019.

Lueck was last seen eight days ago when the Lyft driver dropped her off about 3 a.m. at Hatch Park in North Salt Lake, 50 Center St. The Lyft driver has told police that Lueck was apparently meeting someone at the park who was already waiting for her in a car. Lueck did not seemed "distressed" when she left the Lyft to get into the other vehicle, the Lyft driver told police.

On Tuesday, Assistant Police Chief Tim Doubt said investigators had exhausted all their leads in trying to determine the identity of the person in the other car.

"At this time, we cannot confirm the make or model of the vehicle that picked up Mackenzie, or the description of the person at Hatch Park on June 17," he said.

Doubt said police aren't even sure if a man or woman was waiting for Lueck. He made a public plea for that person to contact detectives.

Police held a press conference Tuesday afternoon to release the airport surveillance photos and answer some questions about the case. As the search for Lueck continues to gain national attention, noticeably more media representatives from outside of Utah attended the press conference than the update given by police a day earlier.

Doubt said surveillance video shows Lueck was last seen wearing a long white cardigan, dark pants, and was carrying a black backpack, a large blue purse or bag, and picked up a brown rolling suitcase from baggage claim.

Mackenzie is 5-foot-6, 120 pounds with blond hair and brown eyes, according to her family.

He said much of the information police gave on Monday, as well as many of the unanswered questions detectives have, hadn't changed as of Tuesday. Namely, investigators don't know if Lueck had an unknown second phone, social media accounts that were unknown to others, if anyone has made contact with her since Monday, or the identity of the driver who picked her up.

When talking about other apps, Brown was asked by the media on Tuesday about a dating app that allegedly shows her profile and activity on it on June 17. Doubt would only say that all her social media accounts were being investigated. When asked specifically if police had verified that Lueck was on a dating app, Doubt declined to answer.

The assistant chief was also asked by the media about reports from friends that Lueck was dating several men who are older.

"We're aware of that, and we're following up on all those leads," Doubt said, while declining to say if any of those people had been interviewed.

As he did on Monday, Doubt said there was still no evidence to show Lueck has been harmed. But he said this kind of behavior is also very unusual for her.

Kristin Murphy, Deseret News
Juliana Cawley, a friend of Mackenzie Lueck, reads a statement from Lueck's family during a press conference at the Public Safety Building in Salt Lake City on Tuesday, June 25, 2019. The 23-year-old has been missing since June 17.

"After discussions with her family and friends, we see no indication she has gone off the grid before. This kind of behavior is uncharacteristic for her, according to them," he said.

Lueck has already missed a midterm test, and she was supposed to fly back to California on Sunday, Doubt said. Police have confirmed she was not on her flight.

Likewise, while Doubt said detectives have used the "whole tool kit of investigative tools” in looking for Lueck, including serving search warrants, he declined to say if warrants had been served on her cellphone through her phone company to find out if she had been calling or texting anyone leading up to her disappearance. In order for police to serve such a warrant, they must have reason to believe a crime has occurred or a person is in potential danger.

Since police established a tip line Monday afternoon dedicated solely to the Lueck case, they have received more than 125 tips as of 2 p.m. Tuesday. That number is 801-799-4420.

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Police say Lueck has had three interactions with Salt Lake City police. One was for a "moving violation" — typically a traffic ticket — in 2015. The other was for an assault case in 2018. And the third was for property of hers that was found and turned back over to her in January. Doubt said all three cases have been resolved and none are connected to her current situation.

Juliana Cawley, One of Lueck's friends who has been in close contact with Lueck's family, read a brief prepared statement Tuesday, again encouraging anyone with information to call police. She also said the police department would be acting as the official media representative of the Lueck family and all comments, statements or questions should go through them.

Salt Lake police also confirmed Tuesday that the FBI was assisting in the case.