Udo Proksch (born Rudolf Proksch; 29 May 1934 – 27 June 2001), also known under the designer name Serge Kirchhofer, was an Austrian businessman, designer, socialite and convicted murderer. A prominent figure in Viennese postwar society, he became known as an eyewear designer, entrepreneur and owner of the famous Viennese confectioner Demel. He was also closely associated with the politically influential Club 45, a social circle connected to leading figures of the Austrian Social Democratic milieu. In 1991, Proksch was convicted in connection with the sinking of the freighter Lucona, which had