Acting on a tip-off, a police team headed by Deputy Superintendent of Police Anjani Kumar Singh today arrested Munni Devi, who is head of Baheri block and sister of jailed gangster Santosh Jha and her husband Sanjay Laldeo.
The two were absconding and police had attached their property, Singh told PTI.
Santosh Jha, a history sheeter, presently lodged at Gaya jail is alleged to be behind the day-light killing of the two engineers on December 26 for extortion.
Non-payment of levy was said to be the motive behind the murder of the two engineers.
The Darbhanga killing had triggered widespread criticism across the country and opposition BJP had raised issue of deteriorating law and order situation in Bihar under Chief Minister Nitish Kumar headed grand secular alliance government.