Sanjeev Dhawan, 43, was fatally shot at around 2.45 a.m. in his Rajinder Nagar residence in central Delhi.
He was taken to nearby hospital where he was declared brought dead.
A case of murder has been registered and hunt is on to nab the assailants, said a police officer.
Dhawan was working as a cardiologist at Sir Ganga Ram hospital in Rajinder Nagar.
