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Jihadi bride Sally Jones was killed in an air strike three days after the Manchester Arena attack, a member of Islamic State executioner gang The Beatles has claimed.
Alexanda Kotey was one of four British-born extremists, including Mohammed Emwazi AKA Jihadi John, who were named after the band by their hostages.
He said he used to be a neighbour of 50-year-old Jones, dubbed the White Widow, and her 12-year-old son JoJo in the Syrian town of Al Mayadin.
If he's telling the truth it would mean former punk rocker Jones, of Chatham, was killed exactly two years ago last week, as Salman Abedi's attack at Manchester took place on May 22, 2017.
The suicide bombing on the Ariana Grande concert killed 23, including Abedi, and Kotey told ITV he thought the air strike was retaliation.
Jones fled to join the caliphate in 2013 and married Junaid Hussein, at one point the third highest IS target.
The computer hacker was killed in 2015.
Jones had adopted the name Umm Hussain al-Britani and encouraged terror attacks before her death, resulting in her being named the most wanted woman in the world.
It was previously reported that Jones and JoJo had been killed in an American Predator drone strike but no date had been revealed.
Kotey, who also admitted being part of a plot to attack soldiers and police in west London, said: "There was a building that was shelled, she lived in the building. It was shelled following the incident in Manchester, which I believe was a retaliation."
"There were families in the building, it was a government building. There were 40 people dead as a result including Sally Jones and her son."
There have been no confirmed sightings of Jones since May 2017 but the government has refused to confirm if she is dead.
Kotey also said he had never spoken to Jones as he was banned from talking to women but did meet her son.
He said JoJo had his legs amputated after an accident with electricity in Raqqa.