The mishap took place when the jeep carrying the couple and their kins rammed into a stationary JCB in Bihar's Bhojpur district, they said.
Rakesh Paswan (24) died on the spot, while his wife Suman Kumari (20) succumbed to her injuries in Sadar hospital. Six others who sustained injuries were taken to the same hospital for treatment where the condition of two of them was stated to be critical, police said.
The ill-fated jeep was bringing the couple and their kins to their native place in Patna after solemnisation of their wedding in Bhojpur district last night, they said.