The victim has been identified as Balwant Singh, a general physician, who has a clinic at Palam village.
Singh was getting some renovation done in his single-room clinic and as he was about to leave for home after the workers left at around 10 PM yesterday, a person approached him, fired a round and fled, a senior police official said.
Police teams rushed to the spot and a case of murder was registered. Efforts are on to nab the accused, DCP (Southwest) Surender Kumar said.
Singh also had dispute with his brothers over division of parental property. All his brothers live in Palam area, an official privy to the investigation said.