Post mortem report is to become the crucial evidence for police in Sarika and her three sons death. It is learnt that Sarika and Anil had a heated argument on Tuesday night over the later's live-in relationship with another woman. The scene of offense has shown that only Sarika's front portion of the body was burnt. Police are suspecting that if she had committed suicide then she might have screamed for help but nobody heard her screaming. Moreover, Sarika might have ran all over the bedroom if she had committed suicide. Police sources said that it was an empty cylinder in Sarika's bedroom.