It is my understanding that Colorado has no provisions for expunging an adult criminal conviction. In terms of sealing, he could only get his record sealed if he was not charged, the case against him was completely dismissed, or he was acquitted of all charges.
Starting ten years after he completes his sentence he may qualify for a pardon - although pardons are reportedly rarely issued in Colorado. For more information on the application process contact Mark Noel, Executive Chambers, 136 State Capitol, Denver, CO 80203-1792; (303) 866-2471.

