Susan Boyle's brother fears his sister will be assassinated by a crazed fan, a day after a male stalker broke into the singer's home.
John Boyle said he was 'very upset' about the lack of security at his sister's council house in Scotland after the singer was confronted by an intruder on her stairs.
Susan had just flown back to Scotland from London where she had been helping to record the Help For Haiti single.
A teenage boy, believed to be about 15 or 16, ran out of the house in Blackburn, West Lothian, as she opened the front door on Tuesday night.
A shaken Susan spent the night at a friend's house, but returned home yesterday.
The star's 59-year-old brother said it was 'extremely worrying' that there had been a second security scare - on Christmas Day she discovered two strangers standing in her back garden, faces pressed against her kitchen window.