Ever since, scientists have looked for the roots of serial murder in the brain's physical state.

从那以后，科学家们就开始到大脑状态中去寻找连环杀手的根源。

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Ultimately, the authorities concluded that Willingham was a man without a conscience whose serial crimes had climaxed, almost inexorably, in murder.

NEWYORKER: Trial by Fire

The Homicide Review Advisory Group said a so-called mercy killing attracted the same mandatory life penalty as serial killings and it said it wanted sentencing for murder to be discretionary.

BBC: Murder: Life sentence unjust, says lawyers' group

Earlier the Homicide Review Advisory Group said a so-called mercy killing attracted the same mandatory life penalty as serial killings and it said it wanted sentencing for murder to be discretionary.

BBC: Lord Chief Justice urges free vote on murder reform