I found a post from Talking Points Memo in 2015 about the man in question. I don't think there is much of anything to add from it but I forgot how it was somewhat of a topic du jour for a few days back then, though in actuality the media never really tried to find him.
https://talkingpointsmemo.com/dc/trump-supporter-obama-muslim-mystery
hope Beattie follows up.
Beattie said on War-Room that the two people who went to Epps’s ranch to question him were visited by the FBI. more needs to come out on that too.