The fiddler is his son in law, Merlin Fontenot. Still plays often as a pickup musician at Randol's. He is on all the Ambrose albums but one, where the fiddler is Leon Doucet. He also was on a couple of La Louisianne Nathan Abshire albums, and did some work with the Balfa Brothers, among others.
He's still around and playing. He did do a solo album some 24 or so years ago...it was on La Louisiane label and also features a great accordion player. The names of all the songs on that album are different but they are really the standard tunes like Lacassine Special, Hathaway Two-Step, Perrodin Two Step, etc. You might can still find it directly from La Louisianne. (just checked and I don't see it) You could email them and request info.
http://www.lalouisiannerecords.com/laloucat.htm