On 2 April 1939, Walery Sławek, a prominent Sanation politician, close associate of Józef Piłsudski, three-time Prime Minister of the Second Polish Republic, and key architect of the April Constitution, shot himself in the mouth with a pistol in his Warsaw apartment.

Sławek did not die immediately; efforts were made to save him, but he succumbed the following morning in a hospital. In his farewell letter, he did not disclose the reasons for his suicide, leaving the motives subject to ongoing speculation and conjecture.

Sławek's situation after Piłsudski's death Józef Piłsudski had envisioned Sławek as a potential President. Sławek expected that after Piłsudski's death, Ignacy Mościcki would resign and nominate him as successor. However, this did not happen. Mościcki formed an informal alliance with General Edward Rydz-Śmigły to marginalize Sławek from the ruling camp. Consequently, Sławek gradually lost direct influence over politics. On 12 October 1935, he resigned as Prime Minister, and on 30 October, he dissolved the Nonpartisan Bloc for Cooperation with the Government. He was also blamed for the low voter turnout (45.9%) in parliamentary elections.

On 22 June 1938, following Stanisław Car's death, Sławek was elected Marshal of the Sejm, supported by many Sanation deputies protesting his treatment by Rydz-Śmigły and Mościcki. However, the Sejm was dissolved by Mościcki on 18 September. In the subsequent elections, Sławek faced attacks from former allies. Stanisław Giza, a researcher at the Józef Piłsudski Institute for Research in Modern History of Poland, recalled:

Suicide

On 2 April 1939, at 8:45 p.m. (the time of Piłsudski's death), Sławek shot himself in the mouth in his Warsaw apartment at 16 . He used an old Browning pistol from his Polish Socialist Party days. His friend Janusz Jędrzejewicz described the weapon:

Before the attempt, Sławek wrote a farewell letter:

He added:

He also left a letter addressed to Mościcki, the contents of which were never disclosed.

The bullet lodged in his palate without piercing his skull. He was rushed to the Józef Piłsudski Military Hospital's Institute of Trauma Surgery. The shot, fired at an angle from an old pistol, failed to penetrate the palate. Sławek underwent a blood transfusion and a two-hour surgery. His condition briefly improved around 4 a.m. on 3 April, but he died at 6:45 without regaining consciousness.

Funeral

After his death, Sławek's body was displayed in his apartment until the funeral, where comrades, colleagues, and the public paid their respects. The funeral took place on 5 April 1939 in Warsaw. The procession, led by Canon Popławski, proceeded from the Field Cathedral of the Polish Army on Długa Street through Warsaw to the Powązki Military Cemetery. Rydz-Śmigły attended just before the service began. As the coffin was removed from the catafalque, Sławek's closest friends surrounded it, preventing Rydz-Śmigły's approach, blaming him for Sławek's death. The coffin was carried by, among others, Aleksander Prystor, Janusz Jędrzejewicz, , and Gen. Lucjan Żeligowski. The funeral became a demonstration by Piłsudski loyalists against the Camp of National Unity. Wreaths included inscriptions such as: "To Walery Sławek – friends from PPS", "To a Friend of the Family – Aleksandra Piłsudska", and "To My Beloved Godfather – Jadwinia Piłsudska".

Motives for suicide According to , Sławek's suicide stemmed from his failure in the Sanation's internal struggle to realize his political vision. similarly points to his "personal political defeat". , however, argues Sławek "voluntarily withdrew from the power struggle". Stanisław Mackiewicz suggests Sławek felt he had failed Piłsudski:

Aleksandra Piłsudska disputed this view. Janusz Jędrzejewicz believed the suicide was a protest against Rydz-Śmigły's policies, which Sławek saw as undermining Piłsudski's legacy. In late 1938 and early 1939, Sławek confided in former PPS colleagues, expressing frustration with the ruling camp's discord, as recounted by Norbert Barlicki to :

Sławek's biographer, , attributes the suicide to overlapping factors:

Leszek Moczulski argues there was no mystery behind the suicide:

Doubts Dariusz Baliszewski questions whether Sławek's death was truly a suicide, citing suspicious circumstances. He notes that Sławek burned numerous personal and official documents before the attempt. Baliszewski cites , wife of , who told Stanisław Giza that Sławek planned a coup d'état with Tomasz Arciszewski and Kazimierz Pużak to overthrow the Składkowski government. Allegedly, Rydz-Śmigły learned of this and ordered Colonel Józef Smoleński of the General Staff's Section II to arrest Sławek for treason. Warned by phone, Sławek supposedly took his life just before the arrest.

Baliszewski acknowledges the lack of evidence for this account, which Smoleński himself refuted:

Baliszewski also references a March 1939 meeting in the Bank Gospodarstwa Krajowego's basement, where deputies and allegedly learned of a coup to install Sławek as president. They informed Mościcki's chaplain, reportedly triggering a search of Sławek's apartment and prompting his suicide. Additionally, Judge Ignacy Wielgus claimed General Marian Kukiel and Stanisław Haller discussed a coup to make Sławek president, Leon Kozłowski prime minister, and Kazimierz Pużak interior minister, with General Kazimierz Sosnkowski urging Sławek to poison Mościcki and align with Germany.

Baliszewski further highlights a peculiar account from Dr. Marek Werner, then a 9-year-old living below Sławek's apartment:

Baliszewski admits these hypotheses lack verifiable evidence but notes three independent accounts of a 1939 conspiracy involving Sławek. He cites Bolesław Nawrocki, executor of Maria Mościcka's will, who claimed she confirmed a 1939 assassination attempt on Mościcki, which the president attributed to Sławek.

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