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The college senior has missed a midterm exam since she vanished, Doubt said.

To Cauley, that shows \"there's something wrong. Because she's never been one to ditch her priorities even when she's been going through tough times.\"

Lueck was scheduled to fly back to California on Sunday, June 23, but wasn't on the flight, Doubt said.

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

\"I would just want anyone to come forward with any information no matter how small it is,\" Stoner said. \"We need to find Kenzie. I'm praying everyday that she's safe.\"

Doubt asked the public to come forward if they know if the college student has an alternate phone, hidden social media contacts or may be in contact with someone online.

Officials at the University of Utah said they're \"deeply concerned about the well-being of Mackenzie 'Kenzie' Lueck and her family.\"

\"The university's dean of students has spoken with Mackenzie’s family to offer support and to express the campus community’s shared hope for her safe return,\" university offiicals said in a statement said. \"The dean’s office is also talking with and providing support to Mackenzie’s classmates.\"

Cauley read a statement on behalf of the family at Tuesday's news conference, urging anyone with information to call the tip line at 801-799-4420.

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