SALT LAKE CITY (AP) — A tech worker accused of killing a Utah college student has pleaded not guilty to 19 felony counts linked to child pornography allegedly found on his computer. A judge entered the pleas to sexual exploitation of a minor charges Thursday on behalf of 32-year-old Ayoola Ajayi. He is also facing separate murder and kidnapping charges in the death of 23-year-old University of Utah student Mackenzie Lueck. She is originally from El Segundo, California. Investigators have said the images of children as young as 4 were found on his computer during the investigation in to Lueck’s death, but have not been linked with her slaying.