The body was found floating in a water tank yesterday.
A 12 gram gold chain, worn by the woman, was missing from her person.
Post-mortem reported revealed that the death was due to strangulation and investigations led to the nabbing of one Shaktivel, hailing from Gudiyattam in Vellore district, police said.
He was working with the woman's grandson.
Shaktivel confessed that he was sleeping outside the woman's the previous night as he was to visit his native place early morning, police said.
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Udyan told investigators that he was influenced by an English serial 'Walking Dead' which he loved to watch and enact, police said.
The accused lived a luxurious life and drove an expensive car. He had LCDs in all the three rooms of his first floor flat at Sakat Nagar, they added.
He didn't hire anybody for cleaning purposes and the entire house was littered with cigarette butts and liquor bottles that were found all over the house, they said.
The leftover of his meals which he brought from hotels and markets were stinking when police went to his house to arrest him on February 2, said police.
The accused used to go out on date with girls, who usually sported hijabs or scarves to conceal their identities, sources close to investigators said.
Udyan had befriended Akanksha Sharma on social media.
Akanksha was living with the accused after telling her parents that she was living in the US but they became suspicious after losing contact with her in December last.
The body of the woman, who hailed from Bankura in West Bengal, was exhumed in the early hours of February 3.
West Bengal police have arrested Udyan here on charges of murdering his live-in partner Akanksha alias Shweta.
The accused told police that he killed her on July 14, last year. Earlier he had said that he allegedly murdered her in December, said police.
The accused was very possessive about Akanksha and he killed her as he found her talking with some person on her mobile phone, police said.
Meanwhile, body of Akanksha was today consigned to flames at Subhash Nagar crematorium here after police advised the family members of the deceased that it wasn't wise to take the body to West Bengal due to its state.