The decomposed bodies of a family of four were found in their apartment in the North 24 Parganas district of West Bengal on Sunday, the police said.
The police suspect that the man, identified as Brindaban Karmakar, 52, killed his family by poisoning them and then died by suicide.
The police went to the house in Khardah after neighbours complained of a foul smell from the apartment. They broke open the door and found the four bodies.
While Mr Karmakar's body was found hanging from the ceiling, the bodies of his wife Debasree, 17-year-old daughter Debaleena, and eight-year-old son Utsaha were found in different places in the flat, the police said.
A suicide note was found, the police said, in which Mr Karmakar claimed his wife had an extra-marital affair and he could not bear it.
A local Trinamool Congress leader said that the man who operates the water pump in the building went to Mr Karmakar's flat on Sunday morning for a bunch of keys but got no response.
"He kept ringing the doorbell but nobody answered. He also noticed a stench and informed the local councillor who alerted the police. Police broke open the door and found the four bodies," he said.
"It is difficult to know the reason behind this," he said, adding that the man met them the day after Kali Pujo.
"This incident has shocked people of the neighbourhood," he said.
Featured Video Of The Day
Minor Changes Introduced To West Bengal Classes 11 And 12 Syllabus West Bengal Man Gets Death Sentence For Minor's Rape And Murder West Bengal Joint Entrance Examination 2025 Schedule Out, know Key Details Video: Rahul Gandhi Approaches BJP MP Who Fell During Protest, This Happens Congress VS BJP Showdown Over Amit Shah's Remark On BR Ambedkar People Seeking Justice For Atul Subhash Chase Rahul Gandhi. He Does This Fury In South Korea As President Faces Impeachment XAT 2025 Admit Card To Be Out On December 20, Know Changes To Exam Pattern Video: Man Calls Out Unruly Behaviour Of Fellow Indians On Thailand Flight Track Latest News Live on NDTV.com and get news updates from India and around the world.