Question: When did Louise Albertine Of Schleswig-Holstein-Sonderburg-Plön's husband die?
Sentence (from "Friedrich, Duke of Schleswig-Holstein-Sonderburg-Glücksburg"): Friedrich was the second- eldest son of Friedrich Wilhelm, Duke of Schleswig- Holstein- Sonderburg- Glücksburg and Princess Louise Caroline of Hesse- Kassel and an elder brother of Christian IX of Denmark.
Relevant evidence: No