Multiple items of evidence were collected from the home and are in the process of being analyzed, Brown added.

Lueck had gone home to Southern California for her grandmother's funeral before flying back to Utah on June 17.

\"PHOTO:
Salt Lake City Police
PHOTO: Salt Lake City police released photos of missing woman Mackenzie Lueck taken by security cameras at the Salt Lake City airport early on June 17, 2019.
>

Since then, Lueck has missed an exam and was not on her flight to California on June 23.

\"I feel very concerned and very worried,\" her friend Kennedy Stoner told \"Good Morning America\" earlier this week. \"It's out of character for Kenzie to go just off the grid like this. She is very close with her family.\"

Chief Brown said that having spoken to Lueck's father, \"I can feel the heartache and the pain and the suffering in his voice as we spoke.\"

The Lyft driver and Lyft officials have spoken to police and have cooperated with the investigation, authorities said.

ABC News' Marilyn Heck contributed to this report.

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