His surviving friend in the fight against Nazism, Rainer Hildebrandt, wrote in his memoirs: "My best friends, Albrecht Haushofer and Horst Heilman, died in the Nazi Reich".
Rainer Hildebrandt erinnerte sich in seinen Memoiren: „Ich habe meine besten Freunde, Albrecht Haushofer und Horst Heilmann, im Nazi-Reich verloren“.