Roni's body found 43 days after his abduction
Members of the Rapid Action Battalion (Rab) retrieved the body, which was dumped in a low-lying area after cutting it into three pieces, at around 3:30pm.
On the basis of confessions made by four people including a young woman who were arrested on Sunday on suspicion of kidnapping Turjo.
For all latest news, follow The Daily Star's Google News channel. The body was sent to the morgue of Dhaka Medical College for autopsy.
The arrestees included Abu Sayed , Mamun, Shewli and Langra Liton.
Rab officials said Shewli made a phone call to Turjo on October 29 and asked him to come to her residence at Rampura and he came accordingly.
"At around 10:00pm, Shewli fed Turjo some sedative medicines with dinner. As Turjo fell unconscious, she strangled him pressing pillows on his face," a Rab official told The Daily Star.
They abducted Turjo and killed him for ransom.
Rab officials said they are hunting for another youth involved in the killing.