Gaddafi had launched the idea of a pan-African gold dinar at least since 2002. He was killed in 2011. The driving force for military action against Lybia in 2011 was not the US, but France. Obama and Hillary Clinton only reluctantly went along with Sarkozy's initiative for military action. Your suggested link between Ghaddafi's killing and "debt based fiat systems" is a conspiracy theory promoted by Russian propaganda channels like RT, but not backed up by facts.