While being convicted for a DUI does not by itself make a person deportable from the US, it will bring your friend to the attention of immigration. He faces potential deportation because he is in the US illegally. The length of any jail sentence will be determined by the criminal or traffic court. Conviction for a DUI will have an affect on his ability to gain residency in the future. It is also considered a serious misdemeanor by immigration for consideration under the new dream act policy.
The answer provided here is general in nature and does not take into account other factors that may need to be reviewed for a more precise answer. You should consult with an immigration attorney before taking any action. The answer here is not intended to create an attorney-client relationship.
Something is missing from these facts. People don't usually get a year in jail for a first DU which is what would cause an illegal immigrant to get deported. Generally, a misdemeanor DUI may cause complications, but won't get you deported even if you're an immigrant that is here illegally. A year in jail could lead to a deportation.
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Whether you can get deported for a isn't the right question because a DUI by itself doesn't mean anything for an illegal immigrant. However, if your friend is not here legally and he does any jail custody at all, he will have an ICE hold placed on him, which will result in removal proceedings. So, to avoid deportation, he has to stay out of jail custody. On a first DUI that should be possible. He should have a good DUI attorney fighting for him.
Other than the small subset of people that are looking for the recent Obama-announce work permits, a DUI carries no immigration consequences.
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