The man accused of killing University of Utah sorority sister Mackenzie Lueck was hit with unrelated child pornography charges this week after investigators probed his computer, according to a new report.

Ayoola Ajayi — accused of killing 23-year-old Lueck and then burning her remains — was charged Tuesday with 19 counts of sexual exploitation of a minor after authorities combed through his computer and found pornographic images of children, the Salt Lake Tribune reported.

Authorities seized Ajayi’s computer June 26 as they investigated Lueck’s death, according to the report.

On July 2, a forensic lab discovered multiple images of images of children engaged in sex acts on the device, according to charging documents filed Tuesday and obtained by the Tribune.

Nineteen of the photos are described in graphic detail in the documents — which mention children posing on a “floral mattress” five times, according to the report.

For now, the charges only encompass child pornography possession, Salt Lake County District Attorney Sam Gill told the paper. He added that prosecutors will use federal resources to find out when the images were taken, who took them, and potentially identify the victims.

“I just want to commend the hard work of both our investigative partners and our attorneys who will continue to work this case very thoroughly,” Gill told the paper. “This continues to be an ongoing investigation.”

Ajayi was formally charged last month with aggravated murder, kidnapping, obstruction of justice and desecration of a human body in connection with the cold-blooded slaying of Lueck.

Lueck had just returned from a trip to her California hometown for her grandmother’s funeral when she took a Lyft from the airport to meet Ajayi. A short time later, her phone was turned off and never turned back on.

Gill said last month that the bubbly college student died of blunt force trauma to the head.

Ajayi then poured gasoline on her body and burned it, prosecutors said.

Her body was charred with her arms tied behind her back — and she had a 2-inch hole in her skull, charging documents reveal.

Lueck’s remains were discovered in a canyon about 85 miles from Ajayi’s Salt Lake City home, where he was arrested in late June.

Ajayi was a former US Army information technology specialist who also served a brief stint in the Utah Army National Guard.