Pappu (35), arrested with illicit Haryana-made liquor, hanged himself from the window of the lock up in Banna Devi police station area last night, police said.
On the complaint of the deceased's wife, a case has been registered against constables Girish Chandra, Amarpal and Ashok Kumar and all the three have been suspended, they said.
A request for a judicial inquiry in connection with the custodial death has also been made to the chief judicial magistrate, they added.
J. Jayalalithaa passes away: Her life in pictures
Photos: Shah Rukh Khan, Deepika Padukone, Alia Bhatt at an awards show
Photos: Big B, Iulia Vantur at Himesh Reshammiya's album launch
Photos: Aamir Khan with 'Dangal' actresses at fashion show
Spotted: Twinkle Khanna, Shriya Saran at an event in Mumbai