In March of 2000, the conceptual artist Mark Lombardi was found hanged in his studio. In the art world, speculation swirled about whether his death was suicide or murder? Why would anyone want to murder Lombardi? Maybe because his intricate drawings revealed connections between George W. Bush and the bin Laden family, as well as other connections between banking, organized crime and intelligence agencies. Patricia Goldstone is the author of "Interlock: Art, Conspiracy, and the Shadow Worlds of Mark Lombardi." She talks about Lombardi's work and the mystery behind his death.