The incident took place on Friday night.
Yusuf, nephew of former Rashtriya Janata Dal (RJD) MP Mohammad Shahabuddin was shot dead in Siwan on Friday night.
Awaiting more details on the case.
The former MP Mohammad Shahabuddin, who is a close aide of RJD chief Lalu Prasad, was convicted of murder on December 9, 2015 and sentenced to life imprisonment. On August 30 last year, the high court upheld their conviction and sentence.
The gangster-turned politician Mohammad Shahabuddin has almost 63 cases against his name relating to murders and kidnapping.
Shahabuddin has been listed as “A” type history sheeter by Bihar government which means that a criminal who is beyond reforms.