Dr Satish Chandra, 42, posted at Amrodha Primary Health Centre was found dead in the hotel with his throat and private parts slit, SSP Kanpur Yashasvi Yadav told reporters here.
The woman claimed that the doctor had been exploiting her sexually for the last 13 years by injecting her sedatives, the police official said.
She does not appear to be in a sound mental condition and had been undergoing treatment for this, Yadav said.
She also tried to courier the chopped body parts to the doctor's family, he said.
En route to delivering the package, the courier employee saw blood stains on the package and contacted the police who seized the parcel after seeing its contents.
Details provided by the courier company employees helped in tracing the accused, Yadav said.