Incognito stalker's cell number found Mamunur Rashid
The question over the killing after rape of Sohagi Jahan Tanu in Comilla remained unresolved even after five days of the incident that took place inside Comilla Cantonment area on Sunday. Police suspect she had been raped before being murdered.  Police are still in the dark and clueless about the killing
There is a growing demand to investigate the Tanu murder case. Police remained clueless about assailants or even the motive that could have led to the incident in a high security area.  
Sources in Kotwali police at Comilla district said police picked up several people in connection with Topu killing and were quizzed but nothing concrete has emerged so far from the interrogations.
Tanu, shared a 10-digit mobile phone number in November last year, saying someone using that number was disturbing her. In a post on November 3, Tanu, who went by the name 'Jahan Zara' on Facebook, wrote, "Some people are so bad... 0197183185 ... Why so many calls from the number ufff ..."
One had commented, "Who is it? Do you know the person? Receive [the call] and talk [to the person]."
 In reply, Tanu had said she did not know the caller.  Many shared the post on Thursday and demanded the owner of that number be tracked down.
 One Saiful Islam Rifat has written on Facebook, "I know there's not much logic in what I am saying. Nevertheless, it should be investigated who used that number. Tanu has been disturbed from this number."
 Another Facebook user, Kamal Hossain Sohrab, says, "Someone from this number used to disturb Tanu. Whose number is it?"
Tanu's last Facebook post was on March 20. She had posted some photos of her tour of Sylhet.  That very night, her body was found in a bush inside Mainamati Cantonment. Her shoes, hair and torn-off scarf were found nearby.
Facebook added the word 'Remembering' above her user name, something it does after a user dies. Tanu's friends had requested Facebook to do so.
She was buried at her village, Mirzapur, in Muradnagar Upazila after an autopsy was performed at Comilla Medical College Hospital.
 An undergraduate student of history at Comilla Victoria College, Tanu was a theatre activist. Her father is a Class IV employee of the Cantonment Board. They lived in Alipur area. Tanu's classmate Mainul Haque Swapan told reporters that she used to tutor students privately because of the family's financial difficulties.  She had left the house of her student around 7:30pm on Sunday. Her body was found two hours late.