The incident took place around 10.30 PM when Raj Mangal Singh and his niece Pinki were walking towards their home from a clinic located in Jaitpur area, police said.
"When the duo reached Tanky Road, they were hit by a speeding car. Singh was thrown in the air and his head hit the footpath as he fell down. Pinky was also hit but she sustained minor injuries and was discharged from the hospital following treatment," said a senior police official.
Meanwhile, the angry passersby also torched the vehicle that hit Singh.
Kumar told police that he wasn't driving the vehicle and that there were three other occupants in the car and one of them was behind the wheel, police said.
"A case under relevant sections of the IPC has been registered at Jaitpur police station. The accused will be arrested soon. The occupants of the car might have been in an inebriated state," the official said.