A 50-year-old man was allegedly killed by a youth over a trivial matter in the Uposhohor area of Sylhet on Tuesday evening.
The deceased, Selim Mia, was the owner of Rainbox Auto Dry Cleaners in the area.
Officer-in-charge of Shahparan Police Station Anisur Rahman said an argument broke out between the accused, Nazmul Islam Monir, and Selim after the latter lost his mobile phone.
"The argument turned violent when Monir suddenly hit Selim with a sharp object, leaving him seriously injured. He was rushed to a nearby hospital where doctors declared him dead on arrival," the OC said.
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The body has been sent to Sylhet Osmani Medical College Hospital for an autopsy.
"We have arrested Monir in connection with the death. We are waiting for the autopsy report," the OC added.