CBI sources said the agency has readied its team which would take over the case as soon as it is handed over to it by the Centre.
They said state government has sent the reference to the Centre which is likely to issue a notification handing over case to CBI.
The sources said notification was expected today but due to "technical" reasons it was delayed and is likely to come to CBI tomorrow after which agency could take over the probe.
44-year-old Raghuraj Pratap Singh alias Raja Bhaiya, who has a criminal record and has been jailed before, figures in the FIR filed by the slain officer's wife Parveen Azad in which the minister was accused of criminal conspiracy. Parveen also demanded a CBI probe.
When contacted, Food and Civil Supplies Minister Raja Bhaiya had refuted allegations.
