The direct causes of the divorce are not known to the public. According to one report, Marie-Auguste had previously abandoned her husband and child to run away with another man, had been forcibly brought back home on the orders of the Kaiser, and had filed for divorce as soon as the war ended, when she saw that her husband's family were at their lowest ebb. Following the divorce, Joachim shot himself in Potsdam on 18 July 1920. One source reports that he had been in financial straits and suffered from "great mental depression". His own brother Prince Eitel Friedrich of Prussia commented that he suffered from "a fit of excessive dementia". Children and grandchildren The only issue of the marriage of Prince Joachim and Princess Marie-Auguste was their son, Prince Karl Franz Josef Wilhelm Friedrich Eduard of Prussia (15 December 1916 – 22 January 1975). On 5 October 1940, Prince Karl married Princess Henriette Hermine Wanda Ida Luise von Schönaich-Carolath (25 November 1918 – 16 March 1972). They divorced on 5 September 1946. They were the parents of three children: Prince Franz Wilhelm Viktor Christoph Stephan of Prussia (born 3 September 1943), he married Maria Vladimirovna, Grand Duchess of Russia, a claimant to the disputed Russian throne. Their child is Grand Duke George Mikhailovich of Russia, Prince of Prussia, born 13 March 1981 in Spain. Prince Friedrich Christian Ludwig of Prussia (3 September 1943 – 26 September 1943) Prince Franz Friedrich Christian of Prussia (born 17 October 1944). After the divorce, Prince Karl married, morganatically, Luise Dora Hartmann (5 September 1909 – 23 April 1961) on 9 November 1946. The childless couple divorced in 1959. Prince Karl's last marriage was to Eva Maria Herrera y Valdeavellano (10 June 1922 – 6 March 1987) on 20 July 1959 in Lima, Peru. They were married until Prince Karl's death and had two daughters; Alexandra Maria Augusta Juana Consuelo Prinzessin von Preussen (born 29 April 1960) Désirée Anastasia Maria Benedicta Prinzessin von Preussen (born 13 July 1961). Regimental Commissions Leutnant (2nd Lieutenant), 1. Garderegiment zu Fuß (1st Regiment of Foot Guards) à la suite, 4. Gardegrenadierlandwehrregiment (4th Reserve Regiment of Grenadier Guards) Honours He received the following orders and decorations: Ancestry Portrayal in fiction Prince Joachim was played by American actor Jesse Plemons in the 2021 Disney fantasy adventure film Jungle Cruise. References 1890 births 1920 suicides Prussian princes German royalty Suicides by