The body of Rajani Rajkumar Verma, who had left home on Thursday for her classes, was found in the fields behind the Apsara Bar yesterday morning.
She had as many as 13 stab wounds, police said.
Today the police arrested Sarveshkumar Sambudayal Verma, who was employed in the tailoring shop run by her father.
He was related to the victim’s mother.
Additional Commissioner of Police Dr. Ravindra Singhal said that police suspected him after learning that Sarveshkumar had cut his finger recently.
His questioning revealed that he had a relationship with the victim, who had become pregnant. On Thursday, she called him to the spot as she wanted money for an abortion.
This led to a quarrel, during which he strangulated her with her scarf, and stabbed her, police said.
Further investigation is on in the case.