In response to a request by an ESCR-Net member, we have written an urgent action letter (attached and below) urging to Mexican authorities to take all necessary measures to clarify the assassination of rights activists Beatriz Alberta Cariño, head of ESCR-Net member CACTUS (Community Working Together Support Center), and Jiry Antero Jaakkola, a citizen of Finland, who was killed this past April 27th, identify and punish all those responsible, and provide immediate and effective protection for his family and colleagues.