DCP (Central) Shweta Chauhan said that the incident was reported around 11:50 pm on Friday and no suicide note was found at the spot.
No suicide note has been recovered yet, police said, adding an investigation is underway to determine the sequence of events.
DCP said, "From preliminary investigation, a suicide note was addressed to his family and friends in which the deceased has wished well for all his known persons."
Gurvinder Singh (58), a resident of Fateh Nagar, was head of the Legal Department of the BJP's West Delhi district unit.
Investigators in the mysterious deaths by hanging of 11 in Delhi's Burari neighbourhood are convinced that it was a case of mass suicide in a ritual practice by the family.