The deceased could not be identified yet.
Biker Bidyut Mondal, son of late Mahendranath Mondal of Haridaskathi village in Manirampur upazila, said three people hired his bike for going to Abhaynagar from Manirampur Bazar.
As soon as they crossed the Sundali Bazar around 11:30pm, three riders asked him to stop the motorcycle.
When Bidyut stopped the bike, one of the riders put a gun to his head and asked him to go away leaving the bike behind.
Local rushed in after the bikers screamed for help and caught one of the snatchers.
Later, they gave him a good beating, leaving him dead on the spot, said officer-in-charge of Abhaynagar Police Station Tajul Islam.
On information, police recovered the body and sent it to hospital morgue for autopsy, he said.