According to the police, the deceased has been identified as Amit Giri, a resident of East Vinod Nagar.
"Amit's sister Babli who was admitted in a private hospital in Mayur Vihar area died during the course of treatment today. His family informed him about the death of his sister," said a police official.
He was on his way to the cemetery on a bike along with his friend when the DTC bus hit them.
His friend too was badly injured in the incident.
Police have registered a case of death due to rash and negligence driving at the local police station. The driver was arrested and the bus was impounded.