Police on Saturday submitted the chargesheet of the family murder case reported from Gurutola village in Kaliachak in June.

The police named Mohammed Asif, 19, as the sole accused in the murders of his parents, sister and grandmother.

“It is a 273-page long chargesheet, uncommon in murder cases. In all, 44 persons have been named as witnesses,” said a police source.

On June 19, bodies of businessman Jawad Ali, 53 his wife Ira Bibi, 36, their daughter Rima Khatun, 14, and Jawad’s mother Alek Noor Bewa, 73, were recovered from the basement of their house in Gurutola village under Kaliachak.

Allegedly, Asif, Ali’s younger son, sedated and murdered them by drowning in February this year, and buried them in trenches on the premises of the family home.

The crime was reported by his elder brother Mohammed Arif, 21, who claimed he was also his brother’s target but somehow fled. When Asif got desperate to sell off his parental property and asked Arif to return to start the process, the latter reported the murders to the police.

Malda SP Alok Rajoria said a special public prosecutor was appointed for the case considering its rare nature. Asif, he said, was booked under IPC Sections 302 (murder), 307 (attempt to murder) and 201 (causing disappearance of evidence of offence, or giving false information to screen offender). Asif was allegedly active on the dark web, said to be useful for illegal activities, and stored firearms with two friends. Police are probing these angles too.

“Once the probe is complete, we might file a separate chargesheet later,” said a police officer.