The 27-year-old was caught in the cross-fire early Sunday morning at Taste of the City Lounge in Crown Heights.
A relative said Diallo came to the U.S. from West Africa two years ago to work.
"So, he was doing the delivery, DoorDash and Uber, gaining in his life with honesty, without stealing nothing. No problem. Never had any problem here," said Diallo's relative, Mamdou Sansoussy, through a translator.
Police say two gunmen, Marvin St. Louis and Jamel Childs, argued before they shot at each other. Both were killed.
Several other victims were shot but are expected to survive.
Investigators say there were four gunmen. The other two have not been found.
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