Question: When did Duchess Charlotte Frederica Of Mecklenburg-Schwerin's husband die?
Sentence (from "Friedrich Franz, Hereditary Grand Duke of Mecklenburg-Schwerin"): Friedrich Franz, Hereditary Grand Duke of Mecklenburg- Schwerin( 22 April 1910 – 31 July 2001) was the heir apparent to the throne of Mecklenburg- Schwerin and a member of the Waffen- SS.
Relevant evidence: No