Shabad Prakash, 55, committed suicide by consuming poison in his LIG flat at Dugri Road on Tuesday.
The Dugri Police has registered a case against the son-in-law of the deceased and two others on charges of abetment to suicide.
Reportedly, the victim was alone in his room when the incident took place. His wife and complainant in the case, Santosh Kaur, said that her son-in-law, Paramjeet Singh is a bank manager and used to stay with the family.
Police found a suicide note from the room in which the deceased had written that Paramjeet Singh, Darshan Singh and Balbir Kaur were responsible for his death.
A case has been registered with the Dugri police under Section 306 (abetment to suicide) of the Indian Penal Code.