A Mexican activist dedicated to searching for "disappeared" people in the northern state of Tamaulipas has been killed.
Miriam Rodriguez died en route to hospital after being shot multiple times on Wednesday - Mother's Day in Mexico – at her home.
Mexico's National Human Rights Commission (CNDH) condemned the murder, saying it underscored the government's failure to keep the public safe and prevent rights violations of people working as human rights advocates.
After her daughter went missing in 2014, Ms Rodriguez began a search and eventually found her remains in the Tamaulipas town of San Fernando, according to a local group committed to searching for the disappeared.
Months later she warned authorities about the perpetrators of the crime, the group said in a statement.
Tamaulipas Attorney General Irving Barrios said the state had been protecting Ms Rodriguez, sending police patrols three times a day to her house.
Mr Barrios also said nine people had been put on trial for her daughter's kidnapping and murder.
The number of people in Mexico disappearing under suspicious circumstances, often related to drug violence, rose to 30,000 by the end of 2016, with Tamaulipas registering 5,563 missing, the highest state total, according to the CNDH.
Well over 100,000 people have died in drug-related violence in Mexico in the past decade.
"Mexico has become a very dangerous place for those who have the courage to devote their lives to search for missing persons," Erika Guevara Rosas, Amnesty International director for the Americas, said in response to Ms Rodriguez's murder.
"The nightmare they face not knowing the fate or whereabouts of their relatives and the dangers they face in their work, which they perform given the negligent response from the authorities, is alarming," Ms Guevara said.
