A college student was seen at the airport in the early morning hours of June 17, 2019.
The University of Utah senior was seen in security images gathering her suitcase at the baggage claim before getting into a car outside the quiet airport.
The final images of the young man were haunting.
Lueck was the average American college student. Her friends described her as a responsible person who cared for others in her life.
She had a job. Kennedy Stoner said that she was like checking off everything that a responsible adult would have on their list.
Lueck came from a close-knit family and wanted to establish her own identity. She was raised in the Church of Latter-Day Saints, but friends said she didn't stay in college.
She wanted to find her own path, according to her friend.
Lueck had returned to Salt Lake City after attending her grandmother's funeral. She told her mother that she had landed safely. She was seen in the images getting into a waiting car at the airport before the car drove away.
It wasn't until three days later that Greg called Salt Lake City Police to conduct a welfare check on his daughter after he was unable to reach her.
I have been trying to reach her. He said in the call that her phone goes to voicemail. I was wondering if I could have someone check on her.
The car was found in the driveway but there was no sign of the missing college student.
The case caught the attention of the Salt Lake City Police.
There are a lot of missing persons cases in Salt Lake City. Todd Mitchell told "Dateline". I try my best to find the ones that raised the hair on the back of your neck, for lack of a better term.
Police were able to get a valuable clue from Lueck's friend and cousin. They discovered that Lueck had gotten into a car the morning she vanished.
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Fine assumed that the driver of the car that drove off the road was the one who kidnapped her.
After Lueck vanished, police were able to track down the driver of the ride-sharing service, who told them he had successfully completed the fare just before 3 a.m.
After looking at the footage from his car leaving the park, investigators were able to rule him out as a suspect. Tracking data from Lyft showed that Canada continued to pick up customers the rest of his shift.
Canada toldDateline: Secrets Uncovered. She was in good spirits when he left.
Man Murders Wife on New Year's Eve. And begins. To look like an accident.
Canada said he wasn't concerned because a car had been waiting to pick her up, even though Lueck commented about the "odd" choice of being dropped off at a park in the middle of the night.
Canada said the situation seemed safe. She knew the person she was getting in the car with.
Lueck's trail went cold after her cell phone was turned off.
The case was stuck at a standstill until investigators got a tip from a former Salt Lake City Police officer.
Joseph and a friend went to a bar with Lueck.
He said she seemed like a very bright girl.
Lueck told Joseph that he was on a dating site. The site is designed to connect wealthy, successful older men to young women.
Joseph didn't know if she was seeking approval or just advice and recommendations.
After looking into her finances, investigators found plane tickets paid for by men she had met on the site and a $300 deposit by another man.
It helped them get a search warrant for Lueck's phone number. The phone was traced to a Salt Lake City home owned by a successful tech worker and a former National Guard member.
The house smelled like bleach and a mattress was missing from the home when investigators got a search warrant. There was a fire in the neighbor's backyard the week before.
They found charred clothing, purses or backpacks, and fragments of human tissue after digging up the backyard of the home.
Salt Lake County Sheriff's Office
The investigators believed that Ajayi moved the body and used his cell phone data to track him down. Lueck's remains were recovered there.
It was horrible. "I said that." It was a sight that we didn't want to see.
As part of a plea deal, he admitted that he had planned the murder before he ever picked Lueck up.
He never offered a reason for why or how.
The father of Lueck confronted the man who took her life before he was sentenced to life in prison.
He said that he was not sure if you had anything to look forward to in the afterlife. My daughter was an amazing young lady with the world ahead of her. She cared about other people. I will not be able to see her blossom in life.