A 27-year-old man, who offered a Rs 50-lakh contract to murder his elder brother, has been arrested along with three contract killers, said the police on Sunday.

Sujan Singh, a 32-year-old resident of Sidhrawali village in Gurgaon along the Delhi-Jaipur-Mumbai national highway, was shot dead on the night of February 12-13.

A case was registered at the Bilaspur police station and the investigation was handed over to the Gurgaon Police crime branch.

Four people, including the deceased man's brother Ajit Singh, have been arrested for the murder.

"Ajit offered Rs 50 lakh to Vinod Kumar alias Murli of Sidhrawali village to kill his brother," said crime branch officer Anil Kumar.

Murli further sub-contracted the killing to Vinod Singh alias Kalu and Pintu, residents of Bhora Khurd village, and promised them Rs 5 lakh each.

The police said the deceased man and his grandmother had sold agricultural land in Rajasthan for Rs 2 crore.

The money was deposited in the grandmother's account, and she had given power of attorney to the elder grandson. The joint family was also planning to sell another two acres of land.

Ajit, who lived with the joint family, however, wanted control of his grandmother's bank account and hatched a conspiracy.

On the day of the killing, Ajit left the family at a marriage function in the village, and went to inform the killers.

Kalu and Pintu reached the spot on a bike and shot Sujan Singh dead while he was walking home. Ajit had already provided nearly Rs 1.5 lakh to the killers.

The police said all the accused will be presented before a court in Gurgaon on Monday.