In the horrific 28-minute video, Rajon was seen tied to a pole, subjected to a brutal assault in which he pleaded for his life.
Rajan begged for his life
Rajon also begged for a glass of water, but his cries and pleas went on deaf ears.
"Please don't beat me like this, I will die", Rajan could be heard saying in the heart-wrenching video.
One of the accused said, "His bones are okay. Beat him some more."
The most painful part of the entire incident is that dozens of onlookers chose to be mute spectators, when the savagery was being committed in front of their eyes.
All of them chose to remain silent as none of them tried to stop the killers or report the incident to police.
The killers of Samiul Alam Rajon, also had the audacity to upload the deadly video on the social networking website Facebook.
Rajon killed as he attempted to steal bicycle?
"The accused killers said that Rajon attempted to steal a bicycle and they wanted to punish him for his crime", reported the Daily Star.
However, his family members claimed that Rajon was innocent and he was not involved in stealing.
Rajon's autopsy report said that he died of brain hemorrhage, as he had severe injuries on his head and 64 injuries were inflicted over him, during the fatal assault.
Accused says he should be 'forgiven'
Five people have been reportedly arrested in the sensational killing of the boy. One of them, identified as Kamrul Islam, was arrested from Saudi Arabia.
Immediately after committing the heinous crime, Islam had fled to Jeddah.
During his arrest, he was quoted saying as, "I made a mistake, please forgive me."
Police chief Hossain was quoted saying as, "It's a brutal and heinous murder and we won't spare anyone."
Bangladeshis call for Justice for Rajon
On Tuesday, July 14, protesters took to the streets demanding death penalty for the killers.
In the capital city, hundreds shouted "Hang them, hang them" outside the national press club.
Protesters also vented their anger on police for not nabbing the killers.