Yusuf, nephew of former Rashtriya Janata Dal (RJD) MP Mohammad Shahabuddin, was shot dead in Siwan on Friday night.
Shahabuddin was elected four times as a Member of Parliament (MP) from Siwan. He was imprisoned for 11 years for his involvement in the murder of RajivRoshan.
The death of Yusuf comes less than a week after a Bihar court framed charges against Shahabuddin and seven others in connection with journalist Rajdev Ranjan's murder case.
Further details are awaited.
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