Rex was a very active Mason, to say the least. He was a Past Grand Master of Masons of Arizona (2006-2007), Deputy for Arizona of the Supreme Council of the Ancient & Accepted Scottish Rite, Southern Jurisdiction, USA, Past Grand High Priest of Royal Arch Masons of Arizona (1997), Past Grand Master of Royal & Select Masters of Arizona (2004), and Past Grand Commander of Knights Templar of Arizona (2007). He was in the Knights of the York Cross of Honor and recipient of the Knight of the York Grand Cross of Honor (Four Quadrants), a Knight Companion of the Red Cross of Constantine, a Board Member for the Scottish Rite Research Society, a Fellow of the Philalethes Society, a Founding Fellow of the Masonic Society, a Friar of the Society of Blue Friars, and recipient of the Knight Grand Cross in the Grand College of Rites.
I'm sure he was a member of more groups, but I couldn't find anything more. I did find, however, that there is a Lodge named after him, the Rex R Hutchens Research Lodge No.5 in Arizona.
Rest in Peace Brother