Sentence:  Under the law of William the Conqueror if a Norman was slain and the slayer was not produced, the district (the hundred) had to pay a fine, and the name <WSD>murdrum</WSD> was given both to the homicide and to the fine in such a case. 
Meaning of the word marked with <WSD> tags:  A secret killing, distinguished from simple homicide in that the victim and the killer are unknown.