Naomi,
"Today, pardons are granted in many countries when individuals have demonstrated that they have fulfilled their debt to society, or are otherwise considered to be deserving. Pardons are sometimes offered to persons who are wrongfully convicted or claim they have been wrongfully convicted. Some believe accepting such a pardon implicitly constitutes an admission of guilt as a pardon does not set aside the conviction, so in some cases the offer is refused. Cases of wrongful conviction are nowadays more often dealt with by appeal than by pardon however, a pardon is sometimes offered when innocence is undisputed to avoid the costs of a retrial. Clemency plays a very important role when capital punishment is applied."
//Pardons are sometimes offered to persons who are wrongfully convicted or claim they have been wrongfully convicted.//
http://en.wikipedia.org/wiki/Pardon
I think a pardon is appropriate, however it can never undo the damage done and the heartbreak it caused his family.