Artur Ugodnikov, who was 26, was shot multiple times in a parking lot at Londonderry Mall in the city's northeast on Tuesday night.
Police say he was killed moments after he walked out of the mall's main entrance at closing time.
Many shoppers were also leaving and were not hurt, but police say stray bullets hit three vehicles.
Two men seen running through the parking lot were wearing dark hoodies.
They are described as between 18 and 25 years old, with dark hair and medium- to dark-coloured skin.
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