Williams long maintained his innocence and the killing was opposed by victim’s family, jurors and office that tried him

Missouri executed a man on death row on Tuesday, despite objections from prosecutors who sought to have his conviction overturned and have supported his claims of innocence.

Marcellus “Khaliifah” Williams, 55, was killed by lethal injection, ending a legal battle that has sparked widespread outrage as the office that originally tried the case suggested he was wrongfully convicted.

In an extraordinary move condemned by civil rights advocates and lawmakers across the US, Missouri’s Republican attorney general, Andrew Bailey, pushed forward with the execution against the wishes of the St Louis county prosecuting attorney’s office.