Klara sold the house in Leonding and moved with young Adolf and Paula to an apartment in Linz, where they lived frugally.

After chest pain began keeping her awake at night, she consulted the family doctor, Eduard Bloch, in January 1907.

"[9] She underwent the mastectomy at Sisters of St. Mercy in Linz, whereupon the surgeon, Karl Urban, discovered that the cancer had already metastasized to the pleural tissue in her chest.

For the next 46 days (from November to early December), Bloch performed daily treatments of iodoform, a then experimental form of chemotherapy.

Klara's mastectomy incisions were reopened, and massive doses of iodoform-soaked gauze were applied directly to the tissue to "burn" the cancer cells.

[9] The treatments proved futile, and Klara Hitler died at home in Linz from the toxic side effects of iodoform on 21 December 1907.

In 1941 and 1943, the Office of Strategic Services (a predecessor of the Central Intelligence Agency) interviewed Bloch to gain information about Hitler's childhood.

For example, she admired his watercolor paintings and drawings and supported his artistic ambitions in opposition to his father, at what cost to herself one may guess.Bloch expressly denied that Hitler's love for his mother was pathological.

[16] He remembered Hitler as the "saddest man I had ever seen" when he was informed about his mother's imminent death, and viewed Klara as a "pious and kind" woman who "would turn in her grave if she knew what became of him".

[17] On 28 March 2012, a descendant of Alois Hitler removed, without ceremony, the tombstone marking his and Klara's grave in Town Cemetery in Leonding, according to Kurt Pittertschatscher, the pastor of the parish.

The descendant is said to be an elderly female relative of Alois's first wife, Anna, who has also given up any rights to the rented burial plot.

(season 10, episode 13, first broadcast March 23, 2014), a main plot point revolves around a video game called Nazi Natal Nightmare, in which the players try to kill Adolf while he is still unborn in Klara's womb.