While the incident occurred in October 2011, the case was registered in June 2012 after the police received the CFSL report of the food samples, confirming that the chapati that was served by the servant had mercury in it.
The case was registered on the complaint of victim Savinder's son Amarpal, a Sector-15 resident, who alleged that Kuldeep tried to serve a poisonous substance (mercury) to his mother by mixing it in food.
The complainant's mother, Savinder Kaur, wife of late Justice Sidhu, had suspected foul play before having her food as she noticed something shining on the chapati. She informed the police, which collected three separate food samples. The CFSL report confirmed that the chapati had mercury in it.
The police said the servant was a government employee and had been serving the justice's family for the past eight years. He used to frequently have heated arguments with Savinder and decided to poison her so that he could get rid of the present job and get a chance to work with a serving justice of the high court.