The rest six convicts were sentenced for different terms.
A bench of Justice Jahangir Hossain and Justice Md Jahangir Hossain delivered the verdict after hearing the death references and appeals of the convicts.
The four death row convicts are Qamrul Islam alias Quamrul , Tajuddin Ahmad alias Badal, Sadik Ahmed alias Bara Moyna and Zakir Hossain alias Pavel alias Raju.
The court, however, commuted life sentence of Noor Ahmed alias Noor Mia to six months, who was sentenced to life-term for recording the video footage of the gruesome incident.
The High Court Division on March 13 set for today to deliver its verdict on death reference and appeals in the case.
Sylhet Metropolitan Sessions Judge’s Court on November 8, 2015 sentenced the four people.
On July 8, 2015, Rajon was beaten to death by the convicts at Kumargaon Bus Stand area of Sylhet Sadar.
The 28-minute video footage went viral and shows Quamrul, in a black T-shirt and lungi, hitting the boy with a stick in the feet, joints of legs, shoulders and in the head.