Colorado Revised Statutes Title 13. Courts and Court Procedure § 13-50.5-105. Release or covenant not to sue

(a) It does not discharge any of the other tortfeasors from liability for their several pro rata shares of liability for the injury, death, damage, or loss unless its terms so provide; but it reduces the aggregate claim against the others to the extent of any degree or percentage of fault or negligence attributable by the finder of fact, pursuant to section 13-21-111(2) or (3) or section 13-21-111.5, to the tortfeasor to whom the release or covenant is given; and

(b) It discharges the tortfeasor to whom it is given from all liability for contribution to any other tortfeasor.