The victim, Biplob Mondol, 19, was an employee of a medicine store in Old Dhaka, police sources said.
OC of Shahbagh police Abu Baker Siddique confirmed the matter.
Police have already arrested Sumon based on the accusation of the family. According to Biplob's father, he fell victim to a road accident in Keraniganj on Sunday and was brought to DMCH. However, Biplob recovered, he claimed adding that the doctors even said that he can go home on Saturday (today).
“Today [yesterday] in the evening, the ward boy Sumon came and said you will be leaving tomorrow, let me give you an injection,” the father said.
“Within five minutes of the injection, my son died,” he added.