Carmela is correct. As a permanent resident convicted of an aggravated felony, he is ineligible to apply for re-admission into the United States. Once convicted of an aggravated felony and deported there is very little one can do. The deportation alone bars him from re-entry for a period of ten years. He may be eligible for a non-immigrant waiver if he wanted to come as a visitor not a permanent resident. but, being who he is and what he was convicted of, it is unlikely that the consulate in Naples would grant the waiver.