Following the horrific Delhi murder case where a man, Aaftab Ameen Poonawalla, 28, was arrested for allegedly killing his 26-year-old live-in partner Shraddha Vikas Walkar, chopping her body into 35 pieces, and disposing of the body parts at different places in and around the national capital has sent the nation into a tizzy and posing questions about how to identify such killers