A group of menentered a house at a village in Nadia district of West Bengal around 7 in the morning and shot dead a man who was sleeping, police said.The deceased, identified as 35-year-old Sadikul Sheikh, was staying in his in-laws' place at Charmahatpur under the jurisdiction of Dhubulia police station since his marriage two years ago."Land dispute in the family may have resulted in the killing," a police officer said.Sheikh, who was engaged in farming in the village, died on the spot.The accused, sons of the brother of Sheikh's father- in-law, were absconding.