From Wikipedia the free encyclopedia Robert Emmett OConnor March 18 1885 September 4 1962 was an American film actor He appeared in 204 films between 1919 and 1950 He is probably best known as the warmhearted bootlegger Paddy Ryan in The Public Enemy 1931 and as Detective Sergeant Henderson pursuing the Marx Brothers in A Night at the Opera 1935 He also appeared as Jonesy the older Paramount gate guard in Billy Wilders 1950 film Sunset Boulevard as well as made a cameo appearance at the very beginning and very end of the MetroGoldwynMayer cartoon short Who Killed Who 1943