There shall be present at the execution of a convicted person the superintendent of the state correctional institution or a deputy superintendent thereof, at least three executioners, two physicians to determine when death supervenes, and other correctional officers, assistants, technicians, and witnesses as determined by the commissioner of corrections. In addition, the convicted person may request the presence of his or her counsel, a member of the clergy, and a reasonable number of relatives and friends, provided that the total number of witnesses appearing at the request of the convicted person shall be determined by the commissioner of corrections.