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

Police investigators had re-opened the case of Lesley's murder even before Kiszko's release -- with several notorious serial killers and pedophiles among those suspected of carrying out the attack.

CNN: Child killer traced by DNA, 32 years on

Sinclair, who has a long history of sexual violence and is currently serving a life sentence for the murder of Mary Gallacher in 1978, is suspected of being a serial killer who is also responsible for the deaths of at least six other women, including Ms Scott and Ms Eadie.

BBC: Double jeopardy 'to be abolished'