Second Additional Sessions Judge, Ramakrishnan had yesterday convicted Gopalakrishnan, Yasodha and Lalithakumari and sentenced them to life for murdering one Srinivasan.
He also slapped a fine of Rs 10,000 each for stealing jewels from the victim's house.
The prosecution case was that the victim Srinivasan used to quarrel frequently with his wife Lalithakumari.
In November that year, the couple had an argument, following which the wife left for her sister's house at Komarapalayam.
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Annoyed over this, Lalithakumari, had gone to Srinivasan's house along with her sister and brother-in-law on the night of November 17 and murdered him.
After committing the crime, the trio took away 23 sovereigns of gold jewels kept in the house to make it appear like a murder for gain.
They later lodged a complaint with the police alleging that an unknown gang of burglars had looted the house after committing the murder.
However, investigation revealed that the three had committed the crime and they were arrested.