Ashok Kumar Yadav, an assistant sub inspector (ASI) posted in Hajipur district headquarters of Vaishali, was shot dead late Friday. His body was found on Saturday, a police officer said.
Yadav left from police station on patrolling duty but did not return, the officer said.
According to the police, he was shot four times.
Ironically, Yadav was killed a day after Bihar police chief P. K. Thakur claimed crime was under control and that the crime graph had decreased.
Opposition BJP leaders had raised a hue and cry over killing of two engineers in Darbhanga district last month and other criminal incidents this month, and termed it as return of jungleraj in Bihar.