Shahidul Islam, the president of the Gazipur district branch of Bangladesh Garments and Industrial Workers Federation, died from profuse bleeding after sustaining a blow to his head.
Shahidul lost consciousness almost immediately after the impact and was pronounced dead on his way to the hospital.
The information was revealed by the forensic department at Shaheed Tajuddin Ahmad Medical College Hospital in Gazipur on Wednesday.
The investigation report, released 45 days after Shahidul's demise, highlighted the nature of the murder.
Mazharul Islam, the head of the Forensic Department at Gazipur's Shaheed Tajuddin Ahmad Medical College Hospital, disclosed to reporters that the fatal blow to Shahidul's head was caused by a blunt object. This blow resulted in a bone fracture slightly above the neck at the back of his head, leading to immediate unconsciousness due to the bleeding.
He further revealed that apart from the head injury, no other physical injuries were identified on Shahidul's body during the post-mortem examination.
"During the autopsy, we found evidence of a head injury and bleeding. Some had speculated that Shahidul might have suffered a heart attack, leading to his death. To verify this, we retrieved his heart and sent it to Dhaka Medical College Hospital's pathology department," said Mazharul.
The report, received on Wednesday, ruled out any heart-related issue as the cause of death. Instead, it attributed the death to brain haemorrhage.
Shahidul's body was sent to Shaheed Tajuddin Ahmad Medical College Hospital in Gazipur for post-mortem examination on the night of the incident.
The next day, on June 26, his viscera were collected and dispatched to Dhaka Medical College Hospital for further examination.
Following this, a court in Gazipur instructed for an immediate report submission. The post-mortem report was issued subsequently by the forensic department of Shaheed Tajuddin Ahmad Medical College Hospital in Gazipur.
Shahidul Islam, the president of the Gazipur district branch of Bangladesh Garments and Industrial Workers Federation, lost his life on June 25 in front of the Prince Jacquard Sweater Limited factory in Tongi, Gazipur. He was attacked by unidentified assailants while working to secure overdue wages for laborers.
Following the incident, Kalpana Akhter, the central president of Bangladesh Garments and Industrial Workers Federation, lodged a case against six named individuals and seven unidentified persons at Tongi West police station on June 26.
Initially, the Tongi West police took charge of the investigation. However, on July 6, the case was handed over to the Gazipur district industrial police for further inquiry.
Imran Ahmed, additional superintendent of police for Gazipur Industrial Police, stated: "Based on the evidence gathered during the investigation, we had already confirmed the impact on Shahidul. However, we awaited the post-mortem findings to ascertain the exact cause of death. Now, it's clear that he (Shahidul) succumbed to his injuries. We're looking into whether there was any motive behind Shahidul's attack and murder."
He also revealed that 10 suspects have been apprehended thus far in connection with Shahidul's murder.
Among them, five are directly implicated in the case, while the remaining five were detained based on confessions provided by the primary suspects.
The investigation is ongoing, with efforts to locate the instigator behind the attack, the police officer added.