Story By: Ana Lacasa, Sub Editor: Joseph Golder, Agency: Central European News Picture Credit: CEN The brother of a key witness in the trial of convicted drug lord Joaquin 'El Chapo' Guzman has been shot dead. Adolfo Lopez Nunez, brother of alleged drug lord Damaso Lopez Nunez, alias ‘El Licenciado’ who was an associate of El Chapo, was shot…