Patna: School teacher Rupam Pathak was on Tuesday sentenced to life imprisonment by a special CBI court for killing BJP MLA Rajkishore Keshri in Bihar's Purnia town last year.

Designated CBI Judge B N Singh had earlier pronounced her guilty of stabbing Keshri to death on January 4, 2011 and fixed today as the date to decide the quantum of punishment.

Soon after the murder of Keshri, the chief minister had recommended a CBI probe into the killing.

On April 2, 2011, the central investigative agency had filed the charge sheet against Pathak under Indian Penal Code's section 304 (culpable homicide not amounting to murder carrying a maximum punishment of life imprisonment).