They found her charred body near a highway underpass on the outskirts of one of India's biggest cities.
The victim, an unnamed 27-year-old veterinarian, was about to hop on her scooter, when she noticed she had a flat tire.
Two men are alleged to have approached her to offer help, but they were not good Samaritans. According to police, the two men were members of a gang of four who had conspired to sexually assault her. One of the men had let the air out of the tire deliberately, police said.
CNN's Rosemary Church talks to Swati Maliwal - an women's rights activist who is leading a hunger strike to force New Delhi to take action.