Prince Felix Felixovich Yusupov , Count Sumarokov-Elston ( ; March 23 , 1887 , Saint Petersburg , Russian Empire -- September 27 , 1967 , Paris , France ) , was best known for helping in the murder of Grigori Rasputin . Rasputin was the faith healer who was said to have influenced Tsar Nicholas II and Tsaritsa Alexandra Feodorovna in their decisions . Prince Felix Felixovich Yusupov , Count Sumarokov-Elston ( ; March 23 , 1887 , Saint Petersburg , Russian Empire -- September 27 , 1967 , Paris , France ) , was best known for participating in the murder of Grigori Rasputin , the faith healer who was said to have influenced decisions of Tsar Nicholas II and Tsaritsa Alexandra Feodorovna .