Teresa Lewis, 41, has admitted to conspiring to kill her husband and stepson. She was scheduled to die by lethal injection on September 23.
Lewis's supporters say she has diminished mental abilities and was manipulated by her accomplices.
The governor of Virginia, Robert McDonnell, has said he will not intervene to stop the execution.
This week, Lewis's case drew global attention when Iranian President Mahmud Ahmadinejad accused the world's media of double standards, contrasting the lack of protests over her impending execution to the outcry surrounding a woman sentenced to be stoned in Iran.
compiled from agency reports