When Philippine environmental activist and radio host Gerry Ortega was shot dead on the tropical island of Palawan, his family and friends believed there was enough damning evidence to convict the alleged mastermind.

But more than 13 years later, the man accused of ordering the hit, former provincial governor Joel Reyes, is in hiding, while his brother, also implicated, is a mayor.

In a country where hundreds of journalists and environmental defenders have been killed in the past two decades, Ortega's murder on January 24, 2011, stands out for its brazenness.