As the national commander of Los Zetas , Treviño Morales earned a notorious reputation for intimidating officials and citizens throughout Mexico . The Mexican authorities believe that he is responsible for a significant part of the violence in Mexico , including the murder of 72 migrants in 2010 and the massacre of 193 people in 2011 . A common torture method of his was known as '' guiso '' ( stew ) , in which victims would be dumped into oil barrels , doused with gasoline and burned alive . Following the death of his boss Lazcano Lazcano in October 2012 , Treviño Morales became his successor and the top leader of Los Zetas drug cartel amid an internal power struggle within the organization
murder of 72 migrants
2010 San Fernando massacre
Miguel Treviño Morales