This is a question for an immigration attorney.
Any response given is not to be taken as legal advice or to create an attorney client relationship.
Hire an immigration attorney. My firm handles criminal immigration matters.
212 537 4407
Legal disclaimer: The statement above is general in nature, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship.
Contact an immigration attorney ASAP. Unfortunately, the immigration consequences should have been dealt with prior to his plea of guilty. You can also contact the immigration defense fund which provides free information for you. I do not believe marriage will keep him in this country, however they will be better to advise you on what if anything can be done at this point. Good luck to you!
There are so many factors that need to be known before answering this question. For starters, we would need to know his current immigration status, where the conviction took place, under what section of the applicable penal law he was convicted, whether he has any prior offenses, and how much time he was sentenced to.
COHEN & FORMAN, LLP
40 Fulton Street - Seventh Floor
New York, NY 10038
Phone: 212-766-9111; 212-766-9177; 212-227-2394
You should retain a good immigration lawyer as this is a complicated matter. He will most likely serve his time and be deported on a serious felony like robbery and it will not help if you get married in most cases.