You have to be brave and nip people drama in the bud quickly. It’s OK to ask your manager for help with this, especially if it’s your first time doing it, but be aware that your manager may actually have an even harder time dealing with the brilliant jerk than you do. She isn’t seeing the immediate impact on team dynamics; she’s just seeing someone who gets things done. Be prepared to have a series of conversations with both the employee and your boss. It may be that a move to a different team will clear up the situation.
