Guillermo Alfredo López , a 55-year-old senior commander of the Argentine National Gendarmerie was shot dead on Thursday in an apparent attempted robbery in the Buenos Aires town of El Palomar , in the Morón district. While the investigation continues to find the killers, a new video of the crime was released in the last few hours showing how the criminals approached the agent, who was arriving at his home with a colleague from the same force, and shot him. It also shows how the gendarme tried to escape from the bullets.