Flack was the older brother of Caroline, the ex-Love Island and X Factor host who was found dead at her home in Stoke Newington, London, on 15 February 2020.
An inquest later established she had taken her own life at the age of 40 while she was facing trial accused of assaulting her boyfriend.
The day before her death Ms Flack had found out she would be prosecuted and feared press intrusion, the London inquest heard.
Her death sparked a debate about online hate and the harm this can have on people's mental health.
Both siblings were born in London but grew up in Norfolk.
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