Police said Hanna was sitting in a white compact car near Humboldt Street and West Avenue 31 when someone walked up and shot her just after 7 p.m.
Police believe Hanna's murder may have been gang-related.
Several people had called police after hearing gunshots, and one witness saw a man running from the scene.
Anyone with information is urged to call the LAPD hotline at (877) LAPD-24-7.
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