Two doctors were coming towards Nalbari on a motor bike when a Barpeta-bound truck from the opposite side hit the bike at Suradi village late last night, the sources said.
Dr Bhabesh Majumdar died on the spot, while the other doctor Gautam Kumar Deka was seriously injured, they said.
Dr Deka has been shifted to the Gauhati Medical College Hospital in a critical condition.
In another accident last night, a bus hit a divider at Dalua near Ghograpar and fell into a roadside ditch causing four persons to be injured.