Four members of a family were murdered at Dhodlekhani in Ram Prasad Rai Rural Municipality-2 of Bhojpur district on Saturday midnight.
Rajendra Rai (30) of Bhojpur Municipality-2 killed his 16-year-old wife Manisha Rai, 68-year-old father-in-law Bel Bahadur Giri, 45-year-old mother-in-law Manju Giri and nine-year-old brother-in-law Sapan Giri, said police.
According to Deepak Shrestha, Police Inspector at the District Police Office, Bhojpur, Rai himself called the police control room at 1:15 am and confessed to the crime.
Rai has also sustained deep abdominal injury.
The District Hospital has referred him for further treatment.
Police said that they are looking into the case.
The incident might have occurred due to a family dispute, according to police.