Friedrich Heimann was the son of Jewish tradesman Jakob Heimann and his wife Friederike. Little is known about the Heimanns’ business. According to the address directory for 1900, Jakob Heimann carried on a wallpaper and glass business at Königswall 2. In the address directory for 1921, Friedrich (Fritz) is listed as a commercial assistant at the same address as his father.
Friedrich Heimann married for the first time in 1927. He was divorced by 1939 at the latest.

On being taken into custody by Dortmund police on 11 January 1939, he was recorded as a “commercial employee”, resident at Münsterstrasse 44. He was arrested at 11.55 p.m. on suspicion of an offence against Section 175, the law prohibiting homosexual acts between men. After two and a half days at Steinwache police station, he was presented in court at 2.00 p.m. on 14 January 1939 and ordered to be held in investigative custody.

On 3 January 1939, he was found guilty by Dortmund magistrates court (“Schöffengericht II”) of committing indecent behaviour in public (Section 183 of the German Criminal Code) in two instances and illicit sexual acts with men, and sentenced to four months’ imprisonment. The time of the pre-trial custody was counted towards this, with the result that Friedrich Heimann was released on 11 May 1939, four months after his arrest.

From 23 February 1939, he served the sentence in Dortmund prison, where the personal prisoner file bears the notification “Jew”, underlined in red. He had already been punished with fines twice before.

On 30 April 1942, along with 177 other Jews from Dortmund (and others from the whole Arnsberg regional administration district), he was deported from Dortmund South Railway Station to Zamość in the “Generalgouvernement”, the German-administered part of Poland. After that, all traces of him disappear. It must be assumed that he was murdered in Zamość.