The private tutor Swarajit Biswas of Durgapur Kacharipara in Nadia's Krishnaganj area had allegedly raped his 16-year old student on May 31 evening, the sources said.
The 16-year-old, a class IX student of Anil Smriti High School would take private tuitions from Biswas.
Biswas had allegedly raped her on the evening of May 31 when she went to attend to nature's call.
The girl told her sister-in-law about the incident on June 1 and consumed pesticide after narrating the incident.
She was first rushed to Krishnaganj Hospital. After stomach wash, she was referred to Shaktinagar Hospital where she succumbed to death, they said.
Her father Parimal Biswas, a day labourer, lodged a complaint with Krishnaganj Police on June 3 against Biswas.
Police arrested Biswas last night.