Multiple reports describe how investigators revisit the circumstances surrounding the death of Ketan Agarwal, after his sister refuses to accept the initial account of an accident. According to the coverage, even after the funeral, the sister continues asking questions and scrutinizing details that she says remain unclear or inconsistent. Her persistence leads authorities to reassess the case rather than treat it as closed. The reports state that the inquiry ultimately points investigators toward Ketan’s fiancée, alleging a murder plot behind what was initially presented as an accident. While the articles emphasize the role of the sister’s doubts in prompting deeper examination, they also frame the development as part of a broader police investigation that relies on evidence and follow-up inquiries. The accounts do not present a single, unified narrative of all investigative steps in the provided text, but they consistently link the case’s unraveling to sustained scrutiny by the victim’s sister and the subsequent shift in suspicion toward the fiancée.