Her roommate called police, and investigators took the woman to Bryan West Campus for a sexual assault exam.

Happy Cab confirmed to investigators that Diriye had driven the woman that night, according to the affidavit.

A patrol investigator interviewed him last summer, and Diriye said he remembered picking the woman up and taking her to Lincoln but denied having sexual contact with her.

But investigators said in the affidavit that the cab's electronic tablet -- used to track fares and routes -- had been shut off shortly after the woman was picked up and turned back on an hour later.

The company told investigators that shouldn't happen unless there are technical problems, and Diriye reported none while he was working May 8 and 9, the investigator wrote.

Diriye's next fare began about two hours after he picked up the Lincoln woman just before 12:30 a.m., according to the affidavit.

Happy Cab fired him after learning of the allegations, operations director John Davis said last summer. Before that, Davis said, the driver had been in good standing.

On Thursday, Diriye's attorney, Jeremy Jorgenson of Omaha, said his client maintains his innocence as he has from the beginning.