Prince Friso of Orange-Nassau ( Johan Friso Bernhard Christiaan David van Oranje-Nassau van Amsberg ; 25 September 1968 -- 12 August 2013 ) was a younger brother of King Willem-Alexander of the Netherlands .
Prince Friso of Orange-Nassau ( Johan Friso Bernhard Christiaan David van Oranje-Nassau van Amsberg ; 25 September 1968 -- 12 August 2013 ) was a member of the Dutch Royal Family .