Mohammed Bablu alias Chunnu (37), a resident of Katihar in Bihar, was arrested from Bandel railway station in Hooghly district late last evening.
The body of 67-year-old Gouri Sen was found at her Netaji Nagar flat on June 17 and it had appeared that the murder was a fallout of a robbery there.
Suspecting that the robbery was staged by the culprits to hide the actual intention behind the murder, police had detained the victim's estranged husband along with some other occupants of the house.
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