ABC News sat down with Idaho State Police Lt. Darren Gilbertson, the lead detective in the Idaho murders case, after Bryan Kohberger was put behind bars for life.

After eight years as chief and nearly 29 years overall with the city police department, Fry retired from his post in May 2024. His decision came about a year and a half after the arrest of Bryan Kohberger, who stabbed the four college students to death for reasons detectives said they still don’t know.

More than 300 documents released by the Moscow Police Department on Wednesday revealed grisly new details about the 2022 murders of four University of Idaho students and the exhaustive investigation that led to Bryan Kohberger's apprehension.

Bryan Kohberger hasn't shared why he killed Madison Mogen, Kaylee Goncalves, Xana Kernodle and Ethan Chapin. Will he ever explain?

Bryan Kohberger, 30, a former criminal-justice doctoral student, faces life in prison without the possibility of parole or appeal under a deal with prosecutors that spared him the death penalty in return for his guilty plea to four counts of first-degree murder.