The city, truck driver and truck manufacturer could have prevented Roxana Buta's death, her mother says.
Roxana Sorina Buta's killer must be brought to justice, lawyer Joseph Tacopina said.
Roxana Buta's mother said police told her a city employee is under investigation for the hit-and-run.
Roxana Sorina Buta's mother and friends held a vigil for her at the Union Square site where she died.
Roxana Sorina Buta was killed in a hit-and-run accident in Union Square last week.
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