Six days after a 15-year-old Agra girl was burnt to death, the Uttar Pradesh Police on Tuesday said they have cracked the case and that Sanjali was killed by her cousin brother Yogesh and two of his relatives.

Agra SSP Amit Pathak said on Tuesday, "We have recovered a love letter from Yogesh's room, which was addressed to Sanjali. She had rejected his proposals saying Yogesh was her brother. After this, Yogesh wanted to take revenge on Sanjali."

According to police, Sanjali's cousin, Yogesh had been stalking her and was dejected after she refused to reciprocate his advances. Yogesh (24), who committed suicide soon after Sanjali's death, had gathered two of his relatives and planned the murder in advance.

Police have now nabbed two of the killers who poured kerosene on the schoolgirl and set her on fire on the instructions of Yogesh.

Two days after Sanjali passed away, Yogesh consumed poison and killed himself.

Admitted at the hospital, Sanjali had said in her statement that the culprits had helmets on but she could still identify one of them as a relative of Yogesh. Sanjali identified him as Yogesh's uncle's son, Vijay.

Police have said that the two accomplices of Yogesh, Vijay and Akash, were riding a bike when they poured the kerosene on Sanjali and set her on fire, causing major burns.

Police have also seized the motorbike that was used in the crime.

The investigators have come across WhatsApp chats, phone call records and a love letter addressed to Sanjali, which incriminated Yogesh.

According to them, Yogesh was influenced by the television programme Crime Patrol that led him to plan and execute the killing.

Police had suspected Yogesh's involvement in the murder from the day of the crime. His suicide two days later, raised their suspicions, which led them to check all his belongings.