A city court on Tuesday sentenced a woman and three others to life imprisonment for killing her husband four years ago.
The deceased, Aditya Kumar, belonged to a royal family of Pilibhit in Uttar Pradesh.
The 43-year-old sugar mill owner was the son of Raja Ram Nath. According to the prosecution, Niti Agarwal killed him with the help of the royal family's cook Nandlal, with whom she allegedly had an extra-marital relationship, and two other accomplices.
Prosecution lawyer Vishal Gupta said the motive of the murder was to grab property.
All the accused, who have been under arrest since August 2007, had been convicted by the court on Saturday.
Agarwal and Kumar got married in 1991 but their relations turned sour after Kumar came to know about his wife's alleged affair. Meanwhile, Agarwal filed a divorce petition and started living in Gurgaon.
Agarwal, who lived in a rented house in Silver Oaks, DLF City, hatched the murder plan with Nandlal and took the help of drivers Zile Singh and Radhey Shyam to dispose of Kumar's body.
Kumar's body was found in Behror, Rajasthan on the Delhi-Jaipur highway. His head was smashed after being strangled to death. Kumar went missing under mysterious circumstances after he came from Pilibhit to Delhi on July 29, 2007.
The hunt began after Aditya's father lodged a complaint that some unknown assailants kidnapped his son and had demanded R1 crore as ransom.
Aditya's father was told to approach Delhi police as the victim was last seen in Delhi.
During investigation, the Delhi Police got some tip-off about Niti’s relationship with Nandlal. After interrogating the two, Niti confessed to the crime.
“I have always treated Agarwal as my mother. The allegation against us is baseless and we will appeal in high court,” said Nandal.