His screams failed to melt the heart of the killer who was pumping air into his body in Khulna, Bdnews24 reported.
"When air was being forced into his body with the pump, I heard him saying, ‘uncle, please stop now, or else,I am going to die",said a man who heard him as saying.
The victim identified as 12 year-old Rakib Hawladar was employed at a garage owned by his killer's relative.
Rakib left the job to escape his torture and took another at a nearby garage at the city's Khan Jahan Ali Road.
Rakib' family alleged it was because of this reason that an annoyed Mia assaulted him.
"His intestines were torn apart and lungs burst due to pumping of an abnormal amount of air into his body," said the doctor who treated him.
Garrage owner, his uncle and mother were caught by the locals after the death of Rakib.