Patna: Laddan Mian, suspected to be the main conspirator in the killing of journalist Rajdeo Ranjan in Bihar's Siwan district, surrendered on Thursday, police said.

Laddan Mian is also considered close to jailed former Rashtriya Janata Dal (RJD) MP Mohammad Shahabuddin. "He has surrendered before the chief judicial magistrate in Siwan district court," a district police officer said.