Singh, who had unsuccessfully contested the last Assembly elections from Jamshedpur West seat on a JMM ticket, was visiting the crowded building, within the limits of Sitaramdera police station, to consult his lawyer in connection with his bail in a pending case, when assailants allegedly opened fire indiscriminately.
A profusely bleeding Singh was rushed to Tata Main Hospital, but was declared "dead on arrival", said Superintendent of Police (City) Prasant Anand.
Soon after the incident two persons were arrested, he said adding, further investigations were on.
Singh, who owns a restaurant in the local bus stand, was released on bail a few months ago after he was arrested and sent to jail in connection with the murder of his business partner Ramshakal Yadav last year.
Among other cases, Singh was also an accused in the firing at the bus stand, which had claimed three lives a few years back.
Bar Association sources said panicky lawyers rushed for safety soon after the incident and a lady lawyer, who fell down in the commotion, suffered minor injuries.
Two of the suspected assailants also suffered injuries after the people caught hold of them and beat up before handing them over to the police.
Senior police officers with adequate force rushed to the spot following the incident to maintain law and order.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)