Kaur was shot dead by two unidentified assailants at Bhaini Sahib near Ludhiana in April last year.
In addition to the murder of Chand Kaur, CBI has also registered two more FIRs related to a car explosion in December 2015 in which a cloth merchant Ajay Kumar was killed in Dugri village, 20 kilometres from Jalandhar.
Besides, FIR in a third case related to the murder of Namdhari leader Avtar Singh Tari in April, 2011 has also been filed in which an accused Dalip Singh has been named.
The CBI took over the probe from Punjab Police.
More From This Section
In its recommendation to handing over of probe to CBI, Punjab government Home Department had said, "All these three incidents are interconnected and appear to be handiwork of same persons or organisation."
"There is commonality in all these cases...All these cases are result of some conspiracy and are part of sinister design of some hostile/anti-national group or organisation whose motive is to disturb peace and law and order in the state. There is urgent need to apprehend the culprits for unearthing the conspiracy and to solve these cases," it said.
"These cases have national and international ramifications and the possibility that the perpetrators have a base in some other part of the country or abroad cannot be ruled out," the notification issued on September 11, 2016 said.