This info was found in a link from another thread
HORST WESSEL An early convert to the Nazi party was 19 year old Bielefeld born Horst Wessel who gave up his law studies to join the SA (Storm Troopers). Working as a taxi driver and builders labourer he soon became a leading orator at SA rallies. In 1929, he married Erna Jaenicke, an 18 year old prostitute. On the evening of January 14, 1930, a group of thugs, led by Jaenicke's former boyfriend and pimp, Albrecht Höhler, called at their lodgings at 62 Grosse Frankfurter Strasse, Berlin and in a fit of jealous anger, Höhler drew a pistol from his pocket and shot Wessel in the mouth. He died five weeks later on February 23. Before his murder he had composed a poem 'Die Fahne Hoch' (Fly the Flag High) which later was changed to 'The Horst Wessel Song' and introduced into Nazi Party ritual. It soon became Nazi Germany's second anthem and played after 'Deutschland Uber Allies' (Germany Before All).