I would not do MFS for NJ. I would do MFJ for NJ since NJ allows part year to be treated as a resident.
If your spouse had state income only from NJ, a part year resident can file a resident return. In fact, since your spouse came from out of the country, you could file a joint return as resident of NJ. If your spouse worked out of state, file a nonresident return for that state before preparing a NJ resident.
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