Prime minister, along with Rupert Murdoch and Barry Humphries, paid tribute to late cartoonist as free-thinker at memorial service This article is more than 3 years old This article is more than 3 years old The prime minister, Malcolm Turnbull, and media mogul Rupert Murdoch have paid tribute to Bill Leak, labelling the late cartoonist a free-thinker and defender of freedom.