Shyam Babu, a key witness in the Yusuf murder case was shot dead in Siwan by bike-borne assailants on Wednesday.
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 Rajiv Roshan.
The death of Yusuf came 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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