Controversial Uttar Pradesh Minister Raghuraj Pratap Singh alias Raja Bhaiya submitted his resignation to Chief Minister Akhilesh Yadav on Monday morning after he was booked for a conspiracy to murder Deputy Superintendent of Police Zia-ul-Haque in Pratapgarh. Four supporters of the minister were also named in the case,which was lodged on a complaint by the Dy SPs wife Parveen Azad. Haque had been circle officer of Kunda,which is Raja Bhaiyya's Assembly constituency. Azad alleged that the minister's supporters killed her husband on Saturday evening on his instructions. Raja Bhaiyya and his supporters had been threatening her husband and he had told her about it,she said. The family has sought a CBI probe in the case. Denying the charges,Raja Bhaiyya had said: "will speak in the House Monday about who is defaming our government." The DySP was killed by a mob when he went to Balipur following the murder of village pradhan Nanhe Lal Yadav,allegedly by Kamta Prasad Pal and three others. The mob also took away Haques service pistol. While Yadav was a worker of the Samajwadi Party,Pal is said to be a supporter of Raja Bhaiyya. The pradhans brother,Suresh Chandra Yadav,was also killed,although the sequence of events is not yet clear.