C.R.S. § 13-1-122: When judge shall not act unless by consent.

A judge shall not act as such in any of the following cases: In an action or proceeding to which he is a party, or in which he is interested; when he is related to either party by consanguinity or affinity in the third degree; or when he has been attorney or counsel for either party in the action or proceeding, unless by consent of all parties to the action.