The Rolling Stones are locked in a legal battle with insurance underwriters regarding their $12.7m (£8m) claim for gigs cancelled following the death of L'Wren Scott.
It was recently announced that investigators would be permitted to gather testimony and documents from Scott's brother Randall Bambrough concerning the late model's mental wellbeing.
Her suicide in March caused the band to postpone a tour of Australia and New Zealand. Jagger was diagnosed as suffering from acute traumatic stress disorder after Scott’s death and was advised by doctors not to perform for at least 30 days.
Before the tour, the group took out a $23.9m (£15m) policy to be paid in the case of cancelled shows due to the death of family members or signficant others. Underwriters are claiming that Scott may have been suffering from a pre-existing mental illness which may mean her death might not be covered under the policy.
Jagger discussed the huge emotional loss with Matt Lauer on The Today Show in July. "It was difficult, you know, very hard year," said Jagger. " But I got back into it by working on touring with the Stones in Europe, and doing other things."