The victim, 44-year-old Sandra Serrano, was shot in her face and back, when a man opened fire on an impromptu celebration on a soccer field around 3:30 a.m. on Monday.
Serrano lived at a city-run migrant shelter near the scene of the shooting.
Two other adults were also shot but survived.
Police believe the gunman was angry after he was robbed of a necklace earlier that evening.
Crime Stoppers is offering a reward of up to $3,500.
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