The man was walking towards the scene in Well Hall Road, Eltham, but has never been traced.
BBC: Stephen Lawrence murder: Eltham witnesses 'never found'
Her 18-year-old son was killed by white youths in a racist attack in Eltham, south-east London, in 1993.
Cianna Roncari from Eltham School for Girls, London, was named as the runner up in the secondary school category.
David Norris was jailed for life in January 2012 for murdering the student in Eltham, south-east London, in 1993.
Gary Dobson, 37, was jailed for life in January 2012 for murdering the teenager in Eltham, south-east London, in 1993.
Cianna Roncari from Eltham Hill Technology College for Girls, London, was named as the runner up in the secondary school category.
Mr Lawrence's jacket was laid out on a groundsheet on the floor of Eltham police station to be photographed later that month.
BBC: Evidence from Stephen Lawrence jacket 'not transferred'
Sir Peter, MP for Worthing West since 1997, previously represented Woolwich West - later renamed Eltham - since a by-election in 1975.
The 18-year-old aspiring architect was murdered in a racist attack as he waited for a bus in Eltham, south east London, on 22 April 1993.
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During Dobson and Norris's trial, the court heard a gang of five or six white youths set upon the A-level student in Eltham, south-east London.
The prosecution alleges they were part of a group of white youths that shouted a racist remark before forcing Mr Lawrence to the ground and stabbing him twice in Eltham, south-east London.
BBC: Evidence from Stephen Lawrence jacket 'not transferred'
Dobson, 36, and Norris, 35, were the first people convicted over the fatal attack on Mr Lawrence by a group of white youths near a bus stop in Eltham on 22 April 1993.
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