Grace Idowu, whose teenage son David was murdered on the Tabard Gardens Estate in 2008, joined Mayor of London Boris Johnson on Thursday to promote a programme of 'peaceful events' to help steer young people away from violence.
On Thursday morning Mrs Idowu met Mayor of London Boris Johnson at Coopers Lane Primary School in Lewisham, together with Margaret Mizen – whose son Jimmy was also killed in 2008 – to talk to children at the school as part of the 100 Days of Peaceful Events programme.
Working in partnership with Kids Company, London Citizens and a collection of charity groups, Youth United, the campaign seeks to support young Londoners in schools, pupil referral units and young offenders so that they develop self esteem, discipline and to help make positive life choices.
"It's a modern day tragedy that so many of our young people are struggling in this city," said Boris Johnson.
"Often ill equipped to get a foothold in the jobs market, it is our duty to ensure that they have the necessary life skills to help deter them from falling into a cycle of crime.
"That is why improving our schools, apprenticeships, training and initiatives like the 100 Days of Peaceful Events are so important in helping to prepare young Londoners for a more positive future."
Margaret Mizen said: "If young people feel that they have a stake in their local community they will feel connected to it.
"If we are to make our city safer for our children, they need to be a part of the conversation.
"Speaking to them about our experiences and hearing theirs is incredibly valuable."
Grace Idowu added: "We have shed too many tears over the young people who have lost their way.
"With the right guidance and opportunities, I hope we can help to steer them away crime and towards hope and peace."