A woman was strangled in Dewanganj upazila on Wednesday.
The deceased was identified as Mursheda Begum, 32, wife of Shahidur Rahman, 40, of Paikpara village.
Police arrested accused Shahidur in connection with the killing.
Quoting family members, MM Mainul Islam, officer-in-charge of Dewanganj Police Station, said Mursheda locked in altercation with Shahidur over the latter's extramarital affair with a woman at night.
Later, Shahidur strangled Mursheda.
It was suicide or murder will be known after postmortem, said the OC.