Well, now we know what happened to him
Uffz. Rudolf Ritter (JG 54)
Pilot - (POW)
Reason for leaving: died from wounds
Died: + 03.08.1943
Hospital : 815
(First Grave)
Ленинградская обл., Мгинский р-н, / the south, 3 km, along the eastern road
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(Russian POW - died Russian hospital -> 815 "HPPG" )
Uffz Ritter, Rudolf, Rudi
712/JG-54, 4/JG-54 (S.U.)Fw 190A-5 Werk# (15)2607 "White 4" (lost 8/3/43)
MIA 3 August, 1943 in aerial combat with 6 Lagg 5s south of Schum (юго-западнее Шум)
.
His first known Soviet victories, Two LaGG-3s, an I-180 and an Il-2 on 13 July, 1943.
A 5th, a LaGG-3 on 15 July, 1943. A Yak-7B on 17 July, 1943.
A 7th, an La-5 on 19 July, 1943.
https://aircrewremembered.com/KrackerDatabase/?q=ritter
But is missing in here => RL 2-III/1192 ???