A warden of Beur central jail in Patna was shot dead allegedly by his nephew on the premises of the high security prison on Thursday morning. Police said assailant Vishal Kumar Singh, 21, committed suicide by shooting himself dead after killing his maternal uncle Santosh Kumar, 40, on the residential premises of the jail. “After a brief exchange of words, Singh took out a pistol and fired at his uncle from point blank range. “But this can only be confirmed after further investigation,” the city SP added. Singh, a resident of Rania Talab area in rural Patna, was staying with Santosh Kumar and preparing for competitive examinations.