Otto Carius received his RK while recovering from illness near Pskov, Russia, May 1944 (he had been suffering from asthma).  Best regards, JR.

Otto Carius - Knight's Cross presentation.

Soviet officers inspect stuck, and then undermined the tank Pz.Kpfw.VI Ausf.B "King Tiger". At the right officer in the hands of the Hungarian cavalry saber. Road Balashnodi - Armat, Hungary. March 1945

Dead  Pz.Kpfw.VI Ausf.B "King Tiger"

Otto Carius was presented with the Oak Leaves to the Knight's Cross of the Iron Cross by Heinrich Himmler, deputising for Hitler, shortly following its award on 27 July 1944.  Carius spent some time in Himmler's company, and they seem to have got on well - in spite of the fact that Carius (typically) had some things to say that Himmler cannot have found particularly comfortable.  Included among these was refusal of an offer of transfer (on promotion) to the Waffen-SS, which Carius explained as resulting from his conservative outlook, and loyalty to his Heer unit (502 Sch. Pz. Batt.).  Best regards, JR.