The woman's husband too suffered injuries due to electric shock when he tried to save them, they said.
The incident occurred when Arhana (27) touched the wire in her house while drying clothes and got electrocuted, they said.
Her father-in-law Lalbihari (60) and husband Pratap (30) were injured in the incident and rushed to a hospital where Lalbihari succumbed to injuries.
An investigation in the incident is underway, police said.