if out of status, tell or show them his visa expired or not. first call and later they will ask to send back the jury letter along with any proof of not being a citizen. in the jury letter, u got to check one that says u r not a US citizen and therfore cant serve as jury. i got first one when i was in out of status, sent back the jury letter with signature and correcting checking and my tourist visa copy. next 2 ones i got when i got asylum. did the same, mailed back the jury letter with correct checking with my asylum papers.
dont ignore it. just mail it back with asylum papers, tourist visa or anything that proves not being a citizen. they will ask for nothing more. it is easy to get this done