How do you remove a name from the lease between two tenants?

Friends of mine, (a married couple) rent a duplex together. They ended up getting into a dissagreement, that got very verbal and physical, to where they've decided that they no longer want the relationship. She's asked him to leave, he told her no and for herself to leave because his name is on the lease... show more Friends of mine, (a married couple) rent a duplex together. They ended up getting into a dissagreement, that got very verbal and physical, to where they've decided that they no longer want the relationship. She's asked him to leave, he told her no and for herself to leave because his name is on the lease as well. (even tho she is the primary tenant, he's an additional tenant) neither feel like they should move from the duplex. He has no family here and she has 4 small children from a previous relationship. To move would put both iin an awkward situation... how do you legally remove either name from the lease agreement.
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