Siwan (Bihar), May 15 (ANI): The wife of senior journalist Rajdev Ranjan, who was shot dead in Bihar’s Siwan district on Friday, has demanded a Central Bureau of Investigation (CBI) probe into the matter to ensure that the guilty is brought to book. The woman named Asha also disclosed that her husband had earlier told her about receiving a threat call post the killing of senior BJP leader Srikant Bharti. She urged the Nitish Kumar-led government to provide them security. Rajdev Ranjan, a journalist with over 20 years of experience, was bureau chief of the Hindi daily Hindustan.