WORLD’S End killer Angus Sinclair has been left “an empty shell” after suffering a series of strokes in prison.
He has had an emergency button strapped to his wrist so he can summon guards in the event of another episode.
Sinclair was found guilty in November last year of the notorious rape and murders of 17-year-olds Christine Eadie and Helen Scott after a night out at the World’s End pub on the Royal Mile.
He was jailed for a minimum of 37 years – the longest sentence ever handed down by a Scottish court, and a legal landmark after amendments to the 800-year old Double Jeopardy law.
But detectives suspect he may be guilty of further as-yet-unsolved killings – of Anna Kenny, 20, Hilda McAuley, a 36-year-old mum-of-two, and 23-year-old nurse Agnes Cooney.
Sinclair – who also receives medication for a heart condition – is reported to have been “losing his balance and falling down like a drunk man” at Glenochil Prison in Clackmannanshire following the strokes.
An insider said: “He has an emergency button strapped to his wrist so, if he has a turn, he presses it and the screws come straight to him.
“They’re only minor strokes but they have left him kind of ruined.
“I don’t think he cares that he will spend what’s left of his life behind bars. He’s a broken, empty shell of a man.”
Sinclair, 70, was already serving two life sentences for a litany of crimes, including murder and rape, when he was convicted of the World’s End killings.
The jury at the High Court in Livingston took just two hours to conclude that Sinclair murdered the two 17-year-olds.
He carried out the crimes with accomplice Gordon Hamilton, his late brother-in-law, who died in 1996 without facing justice.
Sinclair, who evaded conviction at his first trial in 2007 due to insufficient evidence, remained impassive throughout the five-week hearing and admitted he did not care about the girls, who he saw as “objects to be used”.
Former Lothian and Borders Police deputy chief constable Tom Wood, who was involved in the hunt for Sinclair, said the killer had never “shown a shred of remorse” for any of his sickening crimes.
“He is a disgusting human being,” said Mr Wood, who wrote the book The World’s End Murders: The Final Verdict.
“The reality of the crimes for which he has been convicted – the murders and the serious sex assaults on young children alone – shows what an utterly despicable person he is.”
Serial killer Sinclair is among a growing number of elderly prisoners putting huge pressure on Scotland’s jail system.
The latest figures reveal there were 746 inmates over the age of 50 in Scottish jails in 2014 – a 93 per cent increase compared to 387 in 2001.
A spokesman for the Scottish Prison Service said it would not comment on individual prisoners.
But he added: “Due to an ageing prisoner population SPS have introduced healthcare measures to assist elderly prisoners which reflect assistance available in the community.”