Kahlik Grier was fatally shot just before midnight Tuesday after he encountered the alleged gunman who had opened fire at a party a few floors above in the building on Webster Avenue in the Norwood section.
Authorities say 19-year-old Desire Louree was fleeing the building when he ran into Grier, shooting him once in the neck.
Louree is now charged with murder.
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Grier's 21-year-old brother Deshaun Grier was also arrested, charged with criminal possession of a weapon, but at this point it is unclear if his arrest is connected to any of the shootings.
A 19-year-old man and a 22-year-old man were wounded in the initial shooting at the party.
A GoFundMe page has been set up to raise money to help cover Kahlik Grier's funeral costs.
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