Michael Hamilton, 59, is said to have been taken to Stirling Royal Infirmary after collapsing on Tuesday, it was reported today.
His wife Christine was keeping a vigil at his bedside as hospital staff confirmed his condition was "critical".
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Hide AdFriends said Mr Hamilton's health had deteriorated after serial killer Peter Tobin launched an appeal against his 30-year minimum term for the 1991 murder of Vicky, 15.
A friend said: "Michael's been under a lot of strain recently and it looks like his heart has given out."