New Delhi, July 19 -- What was first believed to be an accidental death by electrocution has unraveled into a case of calculated murder driven by betrayal in Delhi, media reports said.

A 36-year-old man, Karan Dev, was brought dead to Mata Rooprani Maggo Hospital on July 13 by his wife Sushmita, who claimed he had been electrocuted accidentally, reported NDTV.

The messages revealed the two were having an affair and had meticulously planned the killing. On the night of the murder, they fed Karan 15 sleeping pills during dinner.

In one of the messages, Sushmita casually said she wanted to nap while Karan was unconscious but still breathing.

Police took Sushmita into custody, and during questioning, she confessed.

She told police her hu...