It happened at a new home under construction on Bayview Avenue in Freeport.
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Mayor Robert Kennedy says the workers were employees of AMSJ Construction Corporation, and it appears they were using planks on top of wood beams as a makeshift scaffold on the third floor.
Its use was not filed or permitted, and the company has been cited for the violation.
A 17-year-old male was taken to the hospital in critical condition, while the other male (age unknown) suffered non-life threatening injuries.
The teen, later identified as Alberto Mejia-Montoya, died of his injuries, officials announced Tuesday.
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Kennedy offered his prayers for the victims.
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