John Boyle concerned for sister's safety
The Britain’s Got Talent star, 48, found an intruder in her property in Scotland.
‘This it the second time something has happened to Susan at her home and it is extremely worrying,’ says John Boyle, 59.
‘Susan is a massive world star…You look at what happened to John Lennon – it’s really worrying.’
John Lennon was shot dead by Mark Chapman, 54, in New York in 1980.
Susan‘s security is thought to have been stepped up following the incident on Tuesday night.