A farmer in his 40s allegedly killed his wife with a sharp weapon in Nimbong gram panchayat in Kalimpong district and inflicted injuries to himself.

Police said Pachyo Lepcha had been admitted to Kalimpong district hospital. His deceased wife, Santumaya Rai, is also in the 40s.

In another incident, Subham Rai, 24, allegedly killed his grandfather, Mani Kumar Rai, 72, at Upper Cart Road near Children Park in Kalimpong town.

Police said preliminary investigation suggested that other members of the family which included grandmother and another grandson were present at the house at the time of the crime.

“The suspects in both the cases have been arrested,” said Hari Krishna Pai, the Kalimpong district police chief. Subham has not fled after incident.

“Subham had earlier gone to Delhi for work and it is suspected that he was into substance abuse earlier,” Roshan Thapa, a neighbour of the Rai family, said.

The grandfather had suffered injuries from a blunt weapon.

Police sources said both the incidents were linked to the “mental health” of the accused.