Additinal District and Sessions Judge (VIII) Ravindra Nath Tripathi sentenced to life imprisonment Guddu Yadav alias Guddu Singh alias Ram Narayan Singh, Ram Pyare Bind and the woman Soni Rai alias Shila Rai.
The court also slapped a fine of Rs 50,000 on each of them.
Nawal Kishore Sah, a resident of Begusarai, who used to run a small business from a shop located at Exhibition Road in the city, was kidnapped by the trio on September 12, 2011 and the abductors demanded a ransom of Rs 20 lakh from him.