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 47-year-old man died shortly after 3pm on Tuesday.
Specialist explosive detection dogs searched through the town examining letter boxes and phone booths for signs of potential devices.
Temperatures reached 29.1C in St James's Park, central London.