Here's
Rule 21(b), Colorado Rules of Criminal Procedure, which describes the recusal and replacement process. Parts of interest BBM.
(b) Substitution of Judges.
(1)
Within 14 days after a case has been assigned to a court, a motion, verified and supported by affidavits of at least two credible persons not related to the defendant, may be filed with the court and served on the opposing party to have a substitution of the judge. Said motion may be filed after the 14-day period only if good cause is shown to the court why it was not filed within the original 14-day period. The motion shall be based on the following grounds:
(I) The judge is related to the defendant or to any attorney of record or attorney otherwise engaged in the case; or
(II) The offense charged is alleged to have been committed against the person or property of the judge, or of some person related to him; or
(III) The judge has been of counsel in the case; or
(IV) The judge is in any way interested or prejudiced with respect to the case, the parties, or counsel.
(2) Any judge who knows of circumstances which disqualify him in a case shall, on his own motion, disqualify himself.
(3) Upon the filing of a motion under this section (b), all other proceedings in the case shall be suspended until a ruling is made thereon. If the motion and supporting affidavits state facts showing grounds for disqualification, the judge shall immediately enter an order disqualifying himself or herself. Upon disqualifying himself or herself, the judge shall notify forthwith the chief judge of the district, who shall assign another judge in the district to hear the action.
If no other judge in the district is available or qualified, the chief judge shall notify forthwith the state court administrator, who shall obtain from the Chief Justice the assignment of a replacement judge.