Jharkhand Chief Minister Arjun Munda on Thursday said police was inquiring into the killing of a nun who spearheaded an anti-displacement stir against a private coal company at Pachwara village in Pakur district.He was talking to reporters in Ranchi on Thursday.Fifty two year old Valsha John was hacked to death on Tuesday by about 35 to 40 unidentified persons at her house in Pachwara under Amrapara block in Pakur district.She hailed from Kerala's Kudapali village in Ernakulam district and came to Pakur 12 years ago.Around three years ago, she began her protest against mining by Panem Coal Company. According to locals, the stir began after villagers feared displacement following mining.Meanwhile, the mortal remains of the nun was on Thursday laid to rest at Dudhiyani in Dumka district.