TEGUCIGALPA, Honduras — A Honduran man was convicted of homicide Monday in the 2016 killing of Berta Cáceres, a prize-winning environmental and Indigenous rights defender.After a three-month trial, the court unanimously found Roberto David Castillo Mejía guilty of participating in the killing of Cáceres, a member of the Lenca Indigenous group who led opposition to a dam project in which Castillo Mejía was involved.The court will convene on Aug. 2 to determine a sentence, which could be between 24 and 30 years. Castillo Mejía, who prosecutors say masterminded the killing, will remain jailed at an army base until sentencing.In December 2019, seven men were sentenced to prison for Cáceres' murder. Four men were sentenced to 34 years for the murder and 16 years for attempted murder. Three others received sentences of 30 years for their roles.At the time, prosecutors said the killers acted on behalf of a company, Desa, that was building a dam being opposed by the activist. Castillo Mejía, who heads the project, was arrested in 2018.Castillo Mejía allegedly paid the hitmen, gave logistical support and provided resources to those already convicted, according to prosecutors.Cáceres was a co-founder of the National Council of Popular and Indigenous Organizations of Honduras. She helped organize opposition to the Agua Zarca dam project, which was to be built on the Galcarque River. The river holds spiritual importance for the Lenca people as well as being a critical source of water. The dam project remains frozen.Cáceres won the prestigious Goldman Prize for her environmental activism in 2015. She was slain at her home in La Esperanza on March 3, 2016. A Mexican activist who was there with her also was shot, but survived. Copyright 2021 NPR. To see more, visit https://www.npr.org.