According to police, the truck loaded with cows travelling from Lanka to Silchar fell overturned on road killing one person - Fakkar Uddin - on the spot last night.
The injured three identified as Laky Bhuyan, Kofik Ali and Saidin Talukdar were admitted to hospital in Lanka, police said.
Five cows also died in the mishap, they said adding that the cause of the accident was yet to be ascertained but was suspected to be due to overloading of cows leading to loss of control of the vehicle.