Rashtriya Janata Dal (RJD) leader Raghuvar Rai on Thursday was shot by unidentified assailants outside his residence in Kalyanpur block of Samastipur, Bihar.
The leader was taken to Darbhanga Medical College and Hospital (DMCH) for medical treatment where he succumbed to his injuries.
According to reports, Rai was shot at by two motorcycle borne assailants when he had gone for a morning walk.
Angry over the killing, hundreds of his supporters later blocked the road near Janardanpur on the Darbhanga-Patna route.
A case was registered.
Further details are awaited.