You may go to to a website which ICE has set up called the Detainee Locator. Go to http://www.ice.gov/locator/
Type in his name , alien number, place of birth etc and you may be able to locate him.
Please be advised sometimes it takes ICE a few days to enter someone into their system so it may not show up until he is in their system.
No attorney-client relationship is created or implied by this communication in any way. Consult a competent immigration attorney preferably one who is a member of the American Immigration Lawyers Association (AILA).
I would highly recommend consulting with an attorney. If he is not released by ICE after they review his conviction they will likely detain him (in Eloy or Florence) and try to revoke his status in removal proceedings before an immigration judge. There are a number of factors involved that could impact his immigration status.
Answers on Avvo are general in nature and do not constitute legal advice; specific answers require knowledge of all the facts. You should consult with an attorney to review all the facts specific to your case in order to receive advice upon which you can reasonably rely.