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 admitted to murdering Xana Kernodle, Ethan Chapin, Madison Mogen and Kaylee Goncalves, but he still hasn't said why he did it.