Chakravyuham: The Trap

In Chaakravyuham, the wife of Sanjay Rao is found dead in her house with her throat slit. S.I. Satya is the investigative officer, and he initially thinks Sanjay is the culprit. Also, he suspects Sharath, a close friend and business partner of Sanjay Rao. Who actually killed Siri? What prompted the killer to murder Siri? This forms part of the crux of the story.