Bryan Kohberger, the man accused of murdering four University of Idaho students, faced a judge Thursday morning for his final pre-trial hearing.

Kohberger’s attorneys have already informed the judge that they believe someone else is responsible for the pre-dawn stabbings at a student house in Moscow, Idaho — the “alternative perpetrator” theory, Judge Steven Hippler revealed. Now the judge is telling lawyers to name the suspect and offer up “any actual evidence” they have against him.