Richard, 6th Prince of Sayn-Wittgenstein-Berleburg

Richard, 6th Prince of Sayn-Wittgenstein-Berleburg (Richard Casimir Karl August Robert Konstantin; 29 October 1934 in Giessen, Germany – 13 March 2017 in Berleburg) was the head of the House of Sayn-Wittgenstein-Berleburg and husband of Princess Benedikte of Denmark.
In July 2003, he underwent surgery for treatment of prostate cancer. He had undergone treatment for skin cancer.
Prince Richard died on the evening of March 13th, 2017 at castle of Berleburg in Germany from a suspected heart attack. Prince Richard's death was sudden. He was 82.