In 2013, David Haines was captured and executed by ISIS terrorists in Syria.
He was one of several Western and Japanese captives held hostage by the gang of four IS militants nicknamed "the Beatles" by their hostages because of their British accents.
Five other men, suspected Islamist terrorists, are on trial in Paris accused of playing a role in kidnapping and torturing four journalists and aid workers in Syria.
ITV News has travelled to Paris with Mr Haines’ daughter Bethany, where she will give evidence.
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