Three German pilots have been credited with Quentin's "kill" at various times, and all three of them may have been his killer. Lt. Karl Thom of Jasta 21, one of the greatest German flying aces of the war, was in the vicinity and had confirmed kills nearby; he was often credited with Quentin's downing, but never claimed the kill. Lt. Christian Donhauser of Jasta 17 claimed credit and publicized himself as Quentin's killer after the war. Sergeant Carl Graeper of Jasta 50 also claimed credit, but if he did fire the fatal shots, it was his only kill during the war. All three of them may have been in the dogfight which claimed Quentin's life.