Convicted killer Bryan Kohberger collected creepy mementos from women in his past life before he moved across the country to Idaho and slaughtered four students in the dead of the night.

Latah County Prosecutor Bill Thompson told the Idaho Statesman that, at the time of his arrest, the 30-year-old criminology PhD student was in possession of 'ID-type cards' belonging to two women he knew years before the murders.

At least one of the women was the killer's former colleague at the Pleasant Valley School District in Pennsylvania.

Thompson revealed the chilling new details about the case one week after Kohberger was sentenced to a lifetime behind bars for the 2022 murders of Madison Mogen, Kaylee Goncalves, Xana Kernodle and Ethan Chapin.

The prosecutor - whose decision to strike a plea deal with the mass killer divided the victims' families - did not reveal the identities of the women whose IDs were taken.