Criminal charges are expected to be filed within the next couple of days. Salt Lake District Attorney Lohra Miller said the slaying of a police officer and killing someone while trying to escape are considered aggravating factors that could lead to a death penalty case.

"There are a number of factors that might be there," she said.

In light of Monday's shooting, both the university and the corrections department suspended prisoner transports for medical needs while a review is conducted.

Corrections officials searched Allgier's cell on Monday, but declined to say what they took from it. They also questioned the inmate's cohorts.

"We're trying to look at any possibility that he would have involved other people," Patterson said. "Those things are being considered."

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Contributing: Geoffrey Fattah

E-mail: bwinslow@desnews.com; preavy@desnews.com