The family of slain Honduran environmentalist Berta Cáceres demanded Tuesday that Roberto David Castillo be given the maximum sentence of 25 years in prison for his role in the murder.

Cáceres, co-founder of the Civic Council of Popular and Indigenous Organizations of Honduras (COPINH) and winner of the Goldman prize for environmental defenders, was shot dead on March 2, 2016 at her home in La Esperanza. A guest in her house, the Mexican environmentalist Gustavo Castro, was also shot but played dead and survived.

In June, Castillo, a former American-trained Honduran army intelligence officer and president of hydroelectric company Desarrollos Energéticos S.A (DESA), was found guilty of being a co-collaborator in the assassination.

"We are demanding the maximum penalty that is established according to the facts that have been proven, and the aggravating factors," said Cáceres' daughter Bertha Zúñiga after the sentencing hearing, which was monitored virtually by the European Union and its member states accredited in the country.