Cellphones, cameras, DNA: how police caught Idaho student killings suspect

A 28-year-old graduate student faces four counts of murder - but families of the victims await answers to the question of why

For a student of criminology, Bryan Kohberger appears to have been remarkably indifferent to modern methods of detective work.

The accused murderer of four friends at the University of Idaho, who were repeatedly stabbed in their beds with a large knife, was snared by procedures that are the nuts and bolts of police television dramas: cameras tracking his car, cellphone records placing him at the scene, and a search of DNA records collected by genealogy websites that threw up a match with Kohberger's family.