30-year-old Ibrahim Newaz was sentenced to 10 years in prison
One Qamrul Islam took the youth, believed to be 20-year old, to Dhaka Medical College Hospital on Friday night, Assistant Sub-Inspector Babul Mia at the hospital's police camp told bdnews24.com.
The doctor declared the man dead on arrival, he said.
"He has a knife wound on his chest and other wounds inflicted by heavy objects," he added.
He also said the police initially identified the youth as Sirajul Islam from South Badda by using a mobile phone found on him.
They would confirm the identity once Sirajul's relatives came to the hospital, he added.