Deputy Inspector General of Police (DIG) Bokaro range, Saket Kumar said Sanjiv Singh, the BJP MLA from Jharia, was arrested after his interrogation at Saraidheal police station in the afternoon.
Neeraj Singh, the former deputy mayor of Dhanbad was gunned down along with his personal assistant Ashok Yadav, bodyguard Munna Tiwary, and driver in on the evening of March 21 at Steel Gate under Saraidhela police station while he was returning from Jharia coal belt in his car.
The other three accused were arrested two weeks ago.
The police had interrogated the Jharia MLA earlier also, but he was let off.
Neeraj was a cousin of Sanjiv and had contested the assembly elections from Jharia seat against him on a Congress ticket.
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