A woman's body was found in a trolley bag in city's Behala area on Sunday, following which her daughter and son-in-law were arrested for alleged involvement in her murder, police said.
The body of the 47-year-old woman was found with her throat slit and hands and legs tied with nylon ropes.
"The video of a neighbour, who recorded the duo dragging a trolley bag early in the morning, helped us identify the culprits," the officer said.
He said the daughter and son-in-law of the woman were detained for questioning and confessed to their crime during interrogation.
Police also recovered the carcass of a pet cat from inside the victim's flat which was locked from outside.
The deceased's husband, a security guard by profession, was not at home on Saturday night during which a quarrel had taken place, police said.
"A knife and clothes stained with blood have been found from beneath a bed in the deceased's flat," he said.
The officer said preliminary investigation has revealed that the deceased was against the lifestyle of the accused duo, which resulted in frequent quarrels.
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