A month into his missing, a truck driver;s body was found in the septic tank of toilet at his house in Tewta village of Shivalaya upazila on Wednesday.
The deceased was Jamal Mallik, 45, of the area.
Officer-in-Charge of Shivalaya Police Station Habibullah Sarker said Jamal's first wife Ayesha Begum, 35, killed him a month ago protesting his second marriage. She kept the body in the toilet.
Police arrested Ayesha Begum and she confessed to killing Jamal, he said.
Victim's brother Jainal Mallik said his brother was a truck driver by profession. He got married again eight to nine months ago. He lived in Dhaka with his second wife. His first wife lived in the village home with two sons and a daughter.
A month ago, Jamal came to meet the elder wife and children. Since then, he went missing.
For the last few days, local people got bad smell from the toilet. They informed police about the matter.
Later, police recovered Jamal's body from there.