The Slovak fighter ace Frantisek Cyprich (http://surfcity.kund.dalnet.se/slovakia_cyprich.htm) passed away on 31 January 2009 as the last of the Slovak aces.
Cyprich has long been thought to be the last pilot to claim a biplane victory when he shot down a Ju 52 on 2 September 1944. However, during mine and Ludovico Slongo’s research for our CR.42 aces book we were in contact with the Hungarian researcher and historian Csaba Becze. His research has shown that one of the NSGr. 7’s pilots claimed a P-38 during combat on 8 February 1945. Unfortunately, his name is not known and nothing more remains about his identity in the existing documents. What is known is that the 14th FG lost two P-38s in this mission.
This combat seems to be the last biplane victory ever claimed.
For more info see: http://surfcity.kund.dalnet.se/falco_germany.htm