British IS recruiter Sally-Anne Jones, dubbed the White Widow, is understood to have been killed in a United States drone strike.
In 2013, she left her home with her then 8-year old son Jojo - leaving her older son behind - to joine the Islamic State "caliphate".
According to the newspaper the Sun, the news of the death of Jones for so long not reported for fear that with her could also kill her 12-year-old son Jojo.
Quoting a British intelligence source who had been briefed by U.S. counterparts, The Sun reported that Jones and her son had been killed in June close to Syria's border with Iraq, as she was attempting to flee the Daesh stronghold of Raqqa.
Jones used social media to try to recruit for ISIS and spread messages of hatred, with more than 20 different handles on Twitter, according to the Guardian, but her online activity stopped in recent months.
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.
Asked about reports Jones' son was killed in the strike, Maj Gen Chapman added: "It is a hard one because under the UN Charters he is under the age of what we would classify as a soldier".
If reports of Jones' death are true, she would be the sixth Briton killed by drones in Syria.
Another source told the Times of London that reports of her demise are "probably accurate".
Major General Chip Chapman, the former MoD head of counter terror, said Jones would have been a "significant" target as a result of her alliance with Hussain and her role in recruiting IS fighters.
He continued: "Even if he got up to really bad things, he shouldn't have been targeted".