In a landmark decision on Monday, the US Supreme Court rejected an appeal by the Mexican government seeking to overturn the execution of one of the country’s most notorious death row inmates.
The court’s ruling on Monday also blocked the state of Hidalgos from executing another inmate in the case.
The US Supreme Judicial Court in New York last year rejected an attempt by Mexico to execute Ricardo Sanchez, an inmate who is on death row in New Mexico for the 1995 killing of a man in a car wash.
The decision is the latest development in a decades-long legal saga over the use of the death penalty in Mexico.
The latest ruling is the third such ruling in less than a year, following a second one on May 1.
It also reverses the state’s decision to execute Sanchez, who was convicted in 2001 of killing a drug dealer in New Jersey and killing a policeman in another city.
Sanchez was convicted of killing Manuel Rodriguez in a 1995 murder in Mexico City and was convicted twice for the slaying of another drug dealer, Carlos Perez, in 1997 in New Orleans.
In both cases, the Mexican Supreme Court said that the death sentence was in line with the countrys constitution and international standards.
In a statement, Hidalga County District Attorney Miguel Angel Garza said the state would appeal the ruling.
The state has sought to execute seven inmates in the last 12 months, but has been blocked three times.
Sanchez, a Mexican national, is one of two inmates on the US death row, which was established in 1968 as the federal death penalty system in the United States.
He was convicted and executed for the murder of Juan Manuel López Rivera, a drug trafficker.
Sanchez and Lópoz were convicted of drug trafficking in New England and are serving their sentences in the federal prison in Florence, Colorado.
In 2001, Sanchez was executed in Hideline, New Jersey after the New Jersey Supreme Court overturned a lower court decision to kill him.
The case was one of several in the 1990s that led to the US abolishing the death row.
In 2000, the United Nations said the US was a “global pariah” for executing inmates.
Last year, the International Criminal Court ruled that the US had failed to respect international obligations when it killed former US President John F Kennedy.