Aysha Siddika Minni was arrested on Tuesday night after the police said she 'appeared to be involved' in the killing of her husband Rifat Sharif, reports news agency UNB.
She was arrested after nearly 12 hours of interrogation.
In a statement, superintendent of police in Barugna, Maruf Hossain, said the investigation officer’s interrogation of Aysha Siddika Minni and analysis of the information she provided appeared to show her involvement in the murder.
"She's been arrested for the sake of proper investigation," the SP said.
Rifat was killed in a broad daylight in front of Barguna Government College on 26 June. According to CCTV footages, Minni appeared to be trying to protect her husband.
Dulal Sharif, Rifat's father, later alleged that his daughter-in-law had a part in the murder and demanded her arrest. The locals supported Dulal's claims and formed a human chain on 14 July demanding her arrest.
Minni rejected the allegation and described it as propaganda to protect the killers.
Police have so far arrested 14 people in connection with Rifat's murder.