"The manner in which Sara (27) was killed in a road accident in Sirsaganj area of Firozabad yesterday raises suspicion and we demand a CBI inquiry into it," her sister Neeti told reporters here.
Niti said that the fact that her sister died in the accident but her brother-in-law escaped unhurt raises doubt.
Alleging that the accident appears to be a part of some "planned conspiracy" which can be revealed only through a CBI probe, Niti said that the family also wants second post mortem examination.
"I want the police to act in an impartial manner...It is important that I am satisfied with it (probe)," she said.
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Sara was killed when the car in which she was travelling overturned and fell into a pit in Firozabad district while her husband Amanmani miraculously escaped unhurt.
Incidentally, Amanmani was evading police as he was wanted in the kidnapping and loot from a contractor in Lucknow. He was arrested after the accident.
According to SSP, Lucknow, Rajesh Pandey, when the police went for his arrest after the accident he tried to hide his identity.
Amanmani's father Amarmani Tripathi, a former minister is an influential politician from Eastern Uttar Pradesh who is currently serving a life sentence in the Madhumita Shukla murder case.
Tripathi was arrested in September 2003 in connection with the murder of poet Madhumita Shukla, with whom he allegedly had an affair, and who was murdered on 9 May 2003.
The post mortem report of Madhumita revealed that she was carrying a foetus that matched the DNA of Amarmani and he and his wife Madhumani Tripathi were sentenced to life imprisonment in October 2007.