Assistant Sub-Inspector Soumen Roy, the lone accused in a case filed over killing three people including his wife and son, confessed to his crime at a Kushtia court on Monday.
Kushtia Additional Chief Judicial Magistrate Enamul Haque recorded his confessional statement under Section 164 in the afternoon.
Officer-in-Charge of Kushtia Model Police Station Nishikanta Sarkar said Soumen confessed that he had committed the murders over alleged extra-marital affair of his wife Asma Khatun.
Victim Asma Khatun's mother Hasina Begum filed the case against Soumen, ASI of Khulna's Phultola Police Station, on Sunday night.
In a chilling incident, Soumen shot dead three people in broad daylight in the district town of Kushtia on Sunday morning.
The gruesome killing took place at the Customs intersection of the district town's PIT Road around 11:00am. After the incident, local people caught ASI Soumen with a pistol and handed him over to the police.