Five years ago the life of Eastenders actress Brooke Kinsella was torn apart when her 16-year-old brother Ben was killed in a knife attack after a night out in north London.
Today, after years of campaigning on knife crime issues, Brooke has been named as a new ambassador for the charity Victim Support.
Brooke and Javed Khan, chief executive officer of Victim Support, joined Nina in the studio.
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The 34-year-old from Coulsdon in Surrey died during the private party in Headley in the early hours of Monday, Surrey Police said.
The Home Office made the arrests at various restaurants across London on July 4.
Mayor of Newham Sir Robin Wales criticised the International Olympic Committee on the fourth anniversary of the opening ceremony.