On Friday morning, the 68-year-old former MP was found in a pool of blood in his house.
Initially, the family members said he died of cardiac arrest.
However, on a complaint by his personal assistant, the police registered a case of unnatural death under Section 174 of the Code of Criminal Procedure and began investigations.
While the opposition blamed Chief Minister and TDP president N. Chandrababu Naidu for the murder and demanded an investigation by the Central Bureau of Investigation (CBI), the TDP alleged that some family members tried to wipe out the evidence from the crime scene before lodging a complaint with the police.
Meanwhile, a Special Investigation Team (SIT) has begun a probe into the case.
Vivekananda Reddy was elected from Kadapa Lok Sabha constituency on a Congress ticket in 1999 and 2004. He was twice elected to the Andhra Pradesh Assembly (1989, 1994) from Pulivendula, a family stronghold.
Vivekananda later quit the Congress and joined the YSR Congress. He lost in the election to the Legislative Council in 2017.
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