The country’s Police Bureau of Investigation (PBI) said the men and women arrested in connection with the death of Nusrat Jahan Rafi would be charged on Wednesday, with prosecutors seeking the death penalty for all 16.
Ms Rafi was allegedly doused with kerosene and set on fire at her school in the town of Feni, after she refused to withdraw a sexual harassment complaint against her head teacher.
She died in hospital five days later, on April 10, sparking public outcry and mass demonstrations calling for her killers to face punishment.
Top government officials, including Bangladeshi Prime Minister Sheikh Hasina, pledged justice for Ms Rafi and promised her family the killers would not be spared.
The case has dominated the country’s media as a harrowing example of the treatment of women in Bangladesh.
A study conducted by women’s rights organisation Bangladeshi Mahila Parishad found that around 950 women were raped in the South Asian country last year.
“Justice has to be ensured,” the group’s general secretary Maleka Banu told the Thomson Reuters Foundation.
“But just ensuring that the Nusrat case is taken care of is not enough. We need to do a lot more to make the situation better for Bangladeshi women,” she added.
Two weeks before her death, Ms Rafi issued a statement at her local police station, accusing the headmaster of her madrasa – an Islamic school – of calling her into his office and touching her inappropriately.
Officers allegedly belittled her complaint at the time, telling her it was “no big deal”.
Eleven days after the alleged assault, the teenager went to school to sit her final exams. It is said that she was lured to the building’s rooftop where a group of around five people allegedly surrounded her and demanded she withdraw her case against the headmaster. When she refused, they allegedly set her on fire.
Ms Rafi died at Dhaka Medical College Hospital four days later, having suffered burns on 80 per cent of her body.
In the ambulance on her way to the hospital, fearing she might not survive, she recorded a statement on her brother’s mobile phone saying: “The teacher touched me, I will fight this crime till my last breath.”
Multiple arrests were made following the incident, with 16 now facing the country’s harshest punishment for their involvement, which includes planning, executing, and aiding and abetting the murder.
All the suspects are now behind bars and 12 of them have made confessional statements detailing the roles played by the 16, according to Bangladeshi newspaper the Daily Star.
“We will be submitting the charge sheet on Wednesday,” confirmed PBI chief Banaj Kumar Majumda.