Jones - dubbed the "White Widow" - was known to be a recruiter and propagandist for IS.
United States spy chiefs reportedly told MI6 that Sally Jones was killed close to the border between Syria and Iraq in June.
The London-born convert is thought to be the latest in an ignoble line of infamous Britons - including her husband - to die after joining the group.
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Reports suggest she was killed by a US Air Force Predator strike as she was attempting to flee Raqqa in Syria heading to Syria stronghold Mayadin.
One of the world's most wanted women, Jones, 50, was a poster girl for IS.
She was entrusted with leading the secretive female wing of the Anwar al-Awlaki battalion, a unit founded by her late husband that is composed exclusively of foreign fighters with the objective of planning and executing attacks in the West.
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The Islamist militant, who left Kent to join ISIS in 2013, was killed close to the border between Syria and Iraq in June.
She frequently used her Twitter to spread propaganda for ISIS and in the past had spoken of her wish to behead a Western prisoner in Syria and kill Christians with a "blunt knife".
In July Aisha, the wife of a British ISIS fighter told Sky News she had once met Jones in the ISIS-controlled territory - she had since fled to a Kurdish refugee camp - and said she was unhappy and wanted to come home.
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When they discovered he was gaming the system, they closed his duplicate accounts and offered him $40 to end the matter. But Casillas continued setting up fake accounts, and the company closed his accounts for good in September.
The pair, known as Mr and Mrs Terror, were previously part of a hacking collective in the United Kingdom known as "TeaMp0isoN".