A senior Delhi Police officer died after he allegedly jumped off the police headquarters' building in the city today. The policeman jumped off the tenth floor, the police said. Prem Ballabh, 53, was being treated for depression at a government hospital for the last 28 days, police officer Anil Mittal said. Mr Ballabh was an Assistant Commissioner of Police and was posted at the Delhi Police headquarters in the busy ITO area in central Delhi.