SALT LAKE CITY (AP) — A Utah college student missing 11 days was abducted and killed and her remains burned in the yard of a man now facing aggravated murder and other charges, authorities said Friday.

Salt Lake City Police Chief Mike Brown, who became emotional at times during a morning press conference, said Ayoola A. Ajayi was being charged with aggravated murder, kidnapping and desecration of a body in the death of 23-year-old Mackenzie Lueck.

He was arrested without incident earlier Friday morning by a SWAT team.

Brown said he told the missing woman's parents in Southern California about the arrest earlier Friday morning. "This is one of the most difficult phone calls I've ever made," he said. Her parents are "devastated and heartbroken by this news."

Lueck disappeared on June 17, after she returned from a trip home for her grandmother's funeral and took a Lyft ride from the airport to a park north of Salt Lake City. She was last seen apparently willingly meeting someone there at about 3 a.m.

Her text conversation with Ajayi was her last communication before her disappearance, and phone location data shows them both at the park within a minute of each other, Brown said.

"This was the same time as Mackenzie's phone stopped receiving any further data or location services," Brown said.

He declined to say exactly how they got in touch. Ajayi has acknowledged speaking with her the evening of June 16, but denied talking to her after or knowing what she looked like — despite having photos of her on his phone, Brown said.

The police chief said investigators were seeking to determine if others were involved. A second person was questioned at the time of his arrest and later released, Brown said.

Police have not discussed a motive for the killing, or specified a cause of death. A judge ordered Ajayi held without bail. It was not known if he has an attorney to speak on his behalf.

After discovering that Ajayi was the last person Lueck communicated with, police searched his home on Wednesday and Thursday. In his backyard, they found a "fresh dig area," and charred items that belonged to Lueck.

They also found burned human remains that matched her DNA profile, Brown said.

It wasn't immediately clear if Ajayi, who had previously been identified as a person of interest in Lueck's disappearance, had an attorney. He had not returned previous messages from The Associated Press prior to his arrest.

Ajayi has worked in information technology for several companies including Dell and Goldman Sachs, according to his LinkedIn page. Goldman Sachs confirmed he worked as a contract employee for less than a year at the Salt Lake City office ending in August 2018. Dell said Ajayi had worked there but didn't provide his dates of employment.

He served in the Utah Army National Guard for six months, but did not complete basic training and was discharged in June 2015, said Major David Gibb. He attended Utah State University on and off for seven years, but did not earn a degree.

Ajayi also appeared to have pursued employment in modeling with a bio page on a website called modelmanagement.com.

Court records show he was divorced this year, and does not have a criminal record in Utah.

Lueck was a part-time senior at the University of Utah studying kinesiology and pre-nursing, and was expected to graduate in Spring 2020. She had been a student since 2014 and had an off-campus apartment. The university offered counseling services to any students or staffers affected by her death.

She is from El Segundo in the Los Angeles area and flew to California for a funeral before returning to Salt Lake City, police said.

Her family reported her missing on June 20 and became more concerned after she missed a planned flight back to Los Angeles last weekend.

Lueck's uncle, who did not provide his name at the police press conference, held back tears as he read a statement from her family thanking the investigators for their work.

"They're also grateful to her community, her friends and others around the nation who have supported this investigation," he said.

Lueck's sorority, Alpha Chi Omega, said in a statement the group is grieving her loss and hoping the members closest to her can find comfort as they remember her lasting impact on her loved ones.