Mukerjea had demanded access to the personal diary maintained by sub-inspector Ganesh Dalvi, a prosecution witness who was part of the team that arrested prime accused Indrani Mukerjea's driver, Shyamvar Rai. Rai later turned an `approver' (prosecution witness). Rai, originally arrested under the Arms Act in 2015, told police about the 2012 murder of Sheena Bora, Indrani's daughter from an earlier relationship.