Question: Why did Grand Duchess Kira Kirillovna Of Russia's mother die?
Sentence (from "Grand Duchess Kira Kirillovna of Russia"): Grand Duchess Kira Kirillovna of Russia (9 May 1909 – 8 September 1967) was the second daughter of Grand Duke Kirill Vladimirovich of Russia and Princess Victoria Melita of Saxe-Coburg and Gotha.
Relevant evidence: Yes