Dipankar Ghosh (32) of Bhajanghat Kalitala in Nadia district was given the capital punishment by Partha Sarathi Mukhopadhyay, Additional Session Judge, Krishnagar.
Five other accused, all family members of the convict, were acquitted and released by the court, Public Prosecutor Ashok Mukherjee said.
Ashima Ghosh (25), wife of the convict, was set on fire on November 24, 2012. She was rushed to a local hospital and later shifted to a hospital in Kolkata where she succumbed to her burns, the Public Prosecutor said.