The incident happened on January 16 when Navneet Kumar, who was posted at Govindpuri police station, was going somewhere on his motorbike in connection with investigation of a case, said a senior police officer.
He had lost a leg in the accident and had sustained severe head injuries, he added.
Today, he succumbed during treatment, he said.
His bike was hit by a car from the front side. He suffered severe injuries including head injuries.
The offending vehicle had been traced and the driver, Prakash Garkoti (44) who is a resident of Govindpuri, had been arrested.