While most scientific studies on disarmament, demobilisation and reintegration (DDR) of former combatants focus on the countryside, the case of the paramilitaries in Medellín, Colombia, provides an exceptional opportunity to study such a process in a metropolitan environment. Analysis reveals how an urban DDR-process may lead to highly contradictory results: a strong decrease in the number of homicides and at the same time a consolidation of networks of criminal groups. Extralegal combatants, especially in an urban environment, are able to form extensive networks with criminal organisations. Although DDR-approaches warn of the risk that ex-combatants may resort to violence, scholars tend to disregard existing networks of groups of combatants and powerful criminal organisations in their analyses. Taking theories on DDR as a starting point and reflecting on earlier local peace initiatives, this article analyses the process with paramilitaries in Medellín. It argues that although, the local peace process has led to some significant results, it has to date failed to address the wider network of criminal organisations within which former paramilitaries were and continue to be involved.