Ronaldo Scott, 21, was found stabbed to death close to Angell Town Park on 4 September.
Det Ch Insp Kate Blackburn said: "Do you remember seeing [the men] in the area around midday on Monday?"
Ronaldo Scott, 21, was found with multiple knife wounds close to Angell Town Park, on Morrison Road, Brixton, just after midday on 4 September.
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