"The man's daughter-in-law Priya and her daughter Harsha (19), both were having illicit affair with their driver Nazeer and the man had come to know about it," police said.
"Jawahar came to know about this recently and objected to it following which the mother, daughter and the driver hatched the conspiracy to kill him," SHO Amer Dharmendra Kumar said.
The lady also involved her minor in the gruesome murder of Jawahar whose body was found wrapped in a canopy cover in Amber area on Monday.
However, the woman, whose husband lives in Dubai, has said that her father-in-law wanted her to have illicit relation with him and used to make advances.
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She suspected Jawahar of performing black magic on her and sought help from the driver Nazeer who introduced her to a Maulvi who helped her to get rid of the black magic.
Priya, Harsha and Nazeer were arrested and the minor accused has been also been held.