The day after the assassination of the Russian Imperial Family more Romanovs were married. The Empress’s sister, Princess Elisabeth of Hesse and by Rhine (1864–1918), was also murdered. Here is the entry from wikipedia on her.
Grand Duchess Elizabeth Feodorovna of Russia (Elizabeth Feodorovna Romanova, Russian: Елизавета Фëдоровна Романова) canonized as St. Elizabeth Romanova (1 November 1864 – 18 July 1918) was a German princess of the House of Hesse, and the wife of Grand Duke Sergei Alexandrovich of Russia, fifth son of Emperor Alexander II of Russia and Princess Marie of Hesse and the Rhine. Granddaughter of Queen Victoria and an older sister of Alexandra, the last Russian Empress, Elizabeth became famous in Russian society for her beauty and charitable works among the poor. After the Socialist Revolutionary Party’s Combat Organization murdered her husband with a dynamite bomb in 1905, Elizabeth publicly forgave Sergei’s murderer and campaigned without success for him to be pardoned. She then departed the Imperial Court and became a nun, founding the Marfo-Mariinsky Convent dedicated to helping the downtrodden of Moscow. In 1918 she was arrested and ultimately buried alive by the Bolsheviks. In 1981 Elizabeth was canonized by the Russian Orthodox Church Outside of Russia, and in 1992 by the Moscow Patriarchate.