Sentence:  In 1160 ten marks were paid for a  "<WSD>murdrum</WSD>" and the pardon given to the Bishop of Winchester. A "<WSD>murdrum</WSD>" was in all cases a secret murder, and if the town was too poor to pay the fine, it was assessed, as in this case, on the whole hundred. 
Meaning of the word marked with <WSD> tags:  A secret killing, distinguished from simple homicide in that the victim and the killer are unknown.