The accused is Shashank Tyagi, a resident of Kaili here, they said.
The case has been lodged on the basis of a complaint registered by the brother of the victim, Gaurav. Gaurav is a resident of Kumarwada, Ballabgarh, they said.
According to the complaint, Shashank had raped the victim on the promise of marriage. He also threw the woman into lakes several times to kill her, the complaint stated.
The complaint further said that Shashank used to blackmail the victim and take money from her, police said.
The woman committed suicide by hanging herself on January 3 this year. Gaurav claimed to have found the suicide note on Janaury 8, police said.
The investigation in the case has been started, they added.