The tycoon, his girl, a union across faiths, and a death
Was Muslim who wed Hindu killed? Father-in-law probed
His body was found by a busy railway track just outside Calcutta with evidence of head injuries.
Police say 29-year-old Rizwanur Rahman committed suicide - but his relatives, human rights activists and many others believe he was murdered, and the case is providing a focal point for an examination of the divide between the city's rich and poor, and its Hindus and Muslims.
The case has also given a severe jolt to the government of West Bengal state, of which Calcutta is the capital.
Police are accused of involvement in the death, and of aiding Rahman's in-laws, a rich Hindu family who had opposed his marriage to Priyanka Todi, a student.
The federal Central Bureau of Investigation has now taken up the case at the urging of the state's High Court, and said Ms Todi's father, the well-known industrialist Ashok Todi, is being investigated for involvement in the suspected murder.