A youth believed to have acquaintance with Sayma slit her throat in her drawing room on Tuesday.

The investigators talked to her husband on Wednesday night, but he could not give them any leads. He told the interrogators that he does not suspect anyone.

One of the investigators, preferring anonymity, told The Daily Star that they are not getting full cooperation from Sayma's husband Jahurul Islam, a retired engineer of the PWD.

The police said they have quizzed two domestic helps of Sayma -- Mina and Aleya -- who were in the house at the time when Sayma was slaughtered. But the two, now on remand, are yet to provide any new information, which could lead the police to arrest the killer.

"We are yet to obtain any useful information," said the investigation officer, Sub-Inspector Shahjahan Ali of New Market Police Station.

Apart from the police, Rapid Action Battalion (Rab) and Criminal Investigation Department are also investigating the murder.

Meanwhile, the police and other investigators talked to a number of people at the workplace of Sayma to know whether she had enmity with anybody.