Critic of Nicaraguan president Daniel Ortega shot dead in Costa Rica

Retired army officer Roberto Samcam was killed in San Jose by gunmen, the latest of several attacks on Ortega's critics

A retired Nicaraguan army officer in exile turned fierce critic of the country's authoritarian president Daniel Ortega has been shot dead in neighboring Costa Rica.

Maj Roberto Samcam, 66, was shot at his apartment building in San Jose on Thursday, reportedly by men pretending to deliver a package.