Great question. First this is a legal matter and the specifics of the case need to be handled through legal channels. I would not discuss the issue with the Soldier.
It is important the Soldier understand they will be treated fairly and that you will be a responsible leader and ensure they receive due process and fair treatment. By treating the Soldier fairly, the Soldier will usually do his/her best with regard to duty performance. If the Soldier is ostracized then other events are more likely. The Soldier can feel isolated, unwanted, become depressed, etc. Therefore it is important to keep the Soldier as part of the team. He may have done something wrong but it is not your position to punish him.