C.R.S. § 18-1.3-1206

The particular day and hour of the execution of said sentence within the week specified in said warrant shall be fixed by the executive director of the department of corrections or the executive director’s designee, and the executive director shall be present thereat or shall appoint some other representative among the officials or officers of the correctional facilities at Cañon City to be present in his or her place and stead. There shall also be present a physician and such guards, attendants, and other persons as the executive director or the executive director’s designee in his or her discretion deems necessary to conduct the execution. In addition, there may be present such witnesses as the executive director or the executive director’s designee in his or her discretion deems desirable, not to exceed eighteen persons. The executive director or the executive director’s designee shall notify the governor of the day and hour for the execution as soon as it has been fixed.