The white sedan: How police found suspect in Idaho slayings

The white sedan cruised past the gray, three-story rental home on a dead-end street in Moscow, Idaho. Then again. And again.

It was unusual behavior in the residential, hillside neighborhood in the quiet hours before dawn. And according to a police affidavit released Thursday, surveillance videos showing the vehicle that November night were key to unraveling the gruesome mystery of who killed four University of Idaho students inside the house.

With little else to go on as a panicked community demanded answers, investigators canvassed security footage from the neighborhood — including one recording of the car speeding away after the slayings — to get a sense of the killer's possible movements, the affidavit said.

Eventually, the document said, police were able to narrow down what was at first known only vaguely as a white sedan to a 2015 Hyundai Elantra registered to Bryan Kohberger, a 28-year-old doctoral student in criminology at Washington State University, just across the border in Pullman, Washington. Further investigation matched Kohberger to DNA at the crime scene, it said.

Kohberger made an initial appearance in an Idaho courtroom on Thursday following his extradition from Pennsylvania, where he was arrested last week. His attorney didn't immediately respond to a request for comment, though a public defender who represented him in Pennsylvania, Jason LaBar, has said he is eager to be exonerated and should not be tried “in the court of public opinion.”

“Tracking movements in public is an important technique when you haven't identified any suspects,” said Mary D. Fan, a criminal law professor at the University of Washington. “You can see movements in public even if you don't have probable cause to get a warrant. We live in a time of ubiquitous cameras. This is a...