A UN expert panel on July 1 condemned the latest murder of a Mexican human rights activist, and called for a thorough, impartial and transparent investigation by state authorities. Sael Silva Cisneros, a prominent lawyer and advocate for Afro-Mexican and LGBTQ rights, was killed in a roadside attack outside the town of Cuajinicuilapa, Guerrero state, on June 5, shortly after delivering a seminar titled “Afro-Mexican dissidences in Guerrero: hist…