Colombian President, Juan Manuel Santos, and Marxist rebel leader, Timochenko, will sign a deal today ending a half-century war. The war had killed a quarter of a million people, stymied the economy and made Colombia a byword for violence. <br/><br/>After four years of negotiations in Havana, both leaders will meet for the first time on Colombian soil in front of world leaders. Their deal to end Latin America's longest-running conflict will turn the FARC guerrilla group into a political party fighting at the ballot box instead of the battlefield it has occupied since 1964.<br/><br/>Some 2,500 foreign and local dignitaries will attend the ceremony in the colonial city of Cartagena. U.N. chief Ban Ki-moon, Cuban President Raul Castro, U.S. <br/><br/>Secretary of State John Kerry and victims of the conflict will also attend the ceremony.