A Boston is most often mentioned. His wingman claimed a Spitfire. The victor over Galland is often given as Demozay, Le Roux or a pilot from 91 who does not return. The circumstances of Galland's death indicate he was shot down by an experienced pilot who used cloud cover to make his attack.
"On the return flight Galland answered a call from a German pilot being attacked by a Spitfire. The Spitfire spotted Galland’s approach and pulled up into the cloud cover. Galland attempted to follow but stalled and had to dive away to regain speed. The Spitfire took the opportunity to dive from the clouds and shoot down Galland’s Fw 190 A-4 (WNr 2402) “Black 1”" (
http://www.luftwaffe.cz/gallandp.html).
regards
Keith