A 27-year-old youth allegedly beat his 80-year-old grandmother to death and assaulted his parents, leaving his father with a fractured arm at their Chinsura home on Sunday night.

The accused youth, who became violent and had to be locked up in a room overnight, was taken into police custody on Monday morning.

Indranil Roy, a resident of Bandel’s Keota Peertala in Chinsura police station limits, had appeared for a West Bengal State Electricity Board recruitment exam in Dum Dum on Sunday.

He had returned home and accompanied his parents Biswajit Roy, a railway employee, and mother Tapasi, a homemaker, to a family gathering near their home.

“We returned together and he retired to his room. Around midnight there was a loud noise. As my wife and I rushed to the place from where the sound had come, we saw him (Indranil) in my mother’s room. He had broken the door and barged in,” said Biswajit.

Indranil has purportedly told the cops that his grandmother used to scold him for not getting a job.

Indranil first allegedly used a chair and then a rod to hit his grandmother senseless.

When his father tried to intervene, he, too, was beaten up.

Indranil’s parents rushed out of their two-storey residence locking the door from outside and alerted the police.

A team of officers of Chinsura police station went to the spot, entered the house and found the elderly woman lifeless in a pool of blood, while Indranil was loitering in the house.

The woman was taken to Chinsura Imambara Hospital where she was declared dead.

“We locked him inside a room and kept him confined for a few hours before more force was summoned,” said an officer.

Early in the morning, Indranil was spotted peeping out of a grille window and fiddling with his mobile phone.

Cops spoke with him for some time, won his confidence and then took him out of the room before formally arresting him.

He has been charged with the murder of his grandmother and attempt to murder and voluntarily causing grievous hurt with dangerous weapons to his parents.

“He was normal throughout the day. He said he had lassi outside. God knows if someone had spiked his drink,” said Biswajit.

Relatives of the Roy family said Indranil went to English-medium schools in Hooghly and had graduated a few years ago.

Currently he was looking for a job.