For months before her death, environmental activist Berta Caceres complained of repeated threats warning her to stop leading protests opposing a hydroelectric project on her Lenca people’s ancestral lands.

Then, on March 3, armed men forced their way into Caceres’ home in the middle of the night, shot her four times and wounded a visiting Mexican activist, who survived by playing dead. The killing prompted widespread condemnation and calls for an independent investigation, in part due to Caceres’ international prominence as the winner of the prestigious Goldman Environmental Prize.