Five criminals appeared before the court for sentence. Their names,
strange to say, were Fraud, Libel, Blackmail, Theft and Murder--each
the namesake of the crime with which one of the others was charged.

The namesake of the crime with which Blackmail was charged was himself
charged with the crime of which the namesake was charged with murder.

The namesake of the crime with which Murder was charged was himself
charged with the crime of which the namesake was charged with fraud.

All the prisoners were found guilty and sentenced. Theft, for
example, got seven years. The criminal who was found guilty of murder
was placed on death row. Who committed the murder? Explain your
reasoning.