"Ruth Ellis was the last woman to be executed in this country," Cox said.
She emphasized that the trial took place two years before the British legal system introduced diminished responsibility as a defense.
"Her case serves as a haunting reminder of a time when our justice system ignored the realities of domestic abuse and coercive control," Cox added.
Supporters previously launched multiple failed clearance attempts in 2003 and 2007, alongside an early 50,000-signature petition to the Home Office.
The case heavily influenced the public movement against capital punishment, contributing to the eventual suspension of the death penalty across Britain in 1965.
During the 1955 trial, prosecutor Christmas Humphreys asked Ellis a single question regarding her intent. "It's obvious when I shot him I intended to kill him," she replied.
The execution was carried out at 9:01 a. m.
on July 13, 1955, by hangman Albert Pierrepoint at Holloway Prison. Ellis was buried in an unmarked grave.
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Laura Enston, Ellis's granddaughter, said: "We are determined to do what we can to right this historic injustice and honour not only Ruth but all victims of domestic abuse who have been let down by the criminal justice system."
