There do not appear to be any records of him killing anyone personally ..only his dogs which he poisoned .They reckon that when he fell out with Ernst Rohm who was shot in his cell as he refused to commit suicide that there was a remote possibility that Hitler shot him but I doubt it ..he was basically a coward who had henchmen to do all those sorts of things for him.
I don't think he saw much action in WW! as he was a messenger for the regimental headquarters of the Bavarian Reserve Regiment and wasn't very willing to leave regimental headquarters . Hardly in the front line .Yet ..he was still awarded the Iron Cross, Second Class,and later the First Class. His position meant that he could still carry on with his painting. So he wasn't exactly in the thick of things..He was however wounded and temporarily blinded by poison gas .He may well have killed someone but it's a long time ago and I doubt we will ever know.
Yes he did,his wife Eva Braun/Hitler,
he shot her in the left temple as she bit on a poison tablet to save her an agonising death if the poison didnt work, (the only humane act he ever carried out). he also shot himself as he bit the poison to save hiself from an agonising death