A first information report was lodged on Friday against Lok Janshakti Party Member of Parliament Surajbhan Singh for his alleged involvement in murder of Ramnaresh Sharma, a senior advocate in Bihar's Begusarai town.

Begusarai Superintendent of Police Amit Lodha confirmed that an FIR was lodged against the MP and two others in connection with the murder.

Ramnaresh Sharma, the additional public prosecutor involved in five cases against Surajbhan Singh in Begusarai district court, was shot dead by two unidentified criminals on Thursday evening at his residence in Begusarai.

Begusarai Bar Association officials Gopal Prasad told rediff.com over telephone that apart from handling a number of cases against Surajbhan Singh, Sharma was also spearheading the trial against him in the much-publicised Rami Singh murder case.

Surajbhan Singh is the prime accused in the murder of Rami Singh.

Begusarai town observed a bandh on Friday against the killing of Sharma. The Communist Party of India gave a call of Begusarai bandh soon after his killing.

Lawyers of Begusarai decided not to celebrate Diwali, the festival of lights, in protest against murder of Sharma.

However, Surajbhan Singh on Friday denied his involvement and demanded a high level probe into the murder of Sharma.

Surajbhan Singh, a known 'bahubali' or muscleman in the state, who faces several criminal charges, including that of murder, extortion, kidnapping and looting, represents Ballia constituency in Parliament.

He is considered close to Union Minister of Steel and LJP chief Ram Vilas Paswan.

Chief Minister Nitish Kumar ordered a high-level probe into the incident and announced a Rs 10 lakh ex-gratia payment to the family of Sharma.

A two-member team of top police officials including Additional Director General of Police Abhayanand and CID Inspector General Rajesh Ranjan will visit Begusarai on Friday to investigate the case.