Couple has split - Deposit question

My tenants, an unmarried couple, had a domestic violence issue and the court says the guy gets to stay in the apartment. (She was the abuser.) He wants her off the lease, which is fine. But, am I required to return half the deposit to her and have him pay her half? He's the one who has a job and pays the rent and paid the deposit. It seems I should just leave the deposit as is, but I like to go 'by the book'. Neither party is asking about it, nor has the court provided any directive. It's a new one for me, so I want to be sure I'm doing this right.