His assassination in August 1950, at the height of the crisis, was linked to anti-communist and royalist elements inside the Belgian intelligence services by a team of historians in 2015;[1] however, the murder remains officially unsolved.

The aftermath of the Liberation of Belgium saw a prolonged period of political crisis, known as the Royal Question, over whether King Leopold III, who was living in exile due to his decision to surrender to Nazi Germany in 1940, could return to his position as monarch.

[4] A similar incident happened in 1993 when Baudouin’s brother and successor Albert II took the oath: libertarian Jean-Pierre Van Rossem shouted “Vive la république d'Europe, vive Julien Lahaut!” (“Long live the republic of Europe, long live Julien Lahaut!”).

[7][8][9] In 2015, a team of Belgian historians under the supervision of Emmanuel Gerard [nl] concluded that Lahaut's assassination had been orchestrated by anti-communist elements inside the intelligence services, with a prominent role for the agent André Moyen.

In 1951 editorial cartoonist André Jacquemotte drew a biographical comic strip about Julien Lahaut's life, which ran in the magazine Jeunesse Belgique.

[10] The left-wing playwright Jean Louvet authored a play about Lahaut's assassination entitled L'homme qui avait le soleil dans sa poche (lit.