Dhaka, Feb. 17 -- Two and a half years after Dr Kazi Sabira Rahman Lipi was found murdered at her residence in Dhaka's Kalabagan, the investigators are struggling with a maze of clues as conclusive evidence remains out of reach.

The Police Bureau of Investigation (PBI) took over from local police and interrogated over 50 individuals, including Dr Sabira's husband AK Shamsuddin Azad, but it remains unclear who and why would kill Sabira.

His arrest and subsequent questioning in custody has revealed no significant evidence.

Azad also declined to provide a confessional statement in court.

After spending some time in jail, he has been released on bail, but investigators continue to harbour suspicions towards him and his driver.

In the cou...