A 41-year-old woman has been executed by lethal injection in the US state of Virginia.
Teresa Lewis had been convicted in the 2002 murder of her husband and step-son.
She is the first female prisoner put to death in the southern state since 1912.
Campaigners against the death penalty in the US had championed her case, insisting Lewis's low IQ of 72, meant her accomplices had taken advantage of her.
A spokesman for the National Coalition to Abolish the Death Penalty, Jack Payden-Travers, described her death as 'legal homicide and nothing more than a legal lynching'.
The US Supreme Court turned down Lewis's appeal for a stay of execution on Tuesday and Virginia Governor Bob McDonnell, as expected, did not intervene in the case.
A group of about 30 opponents of the death penalty rang a bell and prayed as Lewis went to her death in Greensville Prison.
Lewis met her two accomplices, Rodney Fuller and Matthew Shallenberger, in a Walmart store. Soon she began an affair with 22-year-old Shallenberger.
Her lawyers had argued that new evidence, including her low IQ, had appeared since her trial that should prevent her execution.
The key piece of evidence they wanted considered was a letter from Shallenberger, who killed himself in jail in 2006, in which he claimed full responsibility for the murder plot and suggests he pushed Lewis into it.
Lewis' case made global headlines this week when Iranian President Mahmoud Ahmadinejad contrasted the lack of opposition to her impending execution to the 'storm' surrounding a woman sentenced to be stoned in Iran.
