After two agonising years of court hearings, headlines and documentaries, Bryan Kohberger has admitted to the “wilful, unlawful, deliberate” murder of four US college students inside their Idaho home.

The prosecution's suggestion that Kohberger may have had only one intended target on that tragic night has intensified speculation that Madison Mogen was his primary target.

Bryan Kohberger is expected to take a plea deal in the alleged murders of Madison Mogen, 21, Kaylee Goncalves, 21, Xana Kernodle, 20, and Ethan Chapin, 20, who were University of Idaho students