Martha Nolan-O'Slatarra body was found on a boat in Montauk on Monday.
Police in the US say the autopsy of a Carlow woman in New York did not show any evidence of violence.
While the final cause of Martha Nolan-O'Slatarra's death is yet to be determined, Suffolk County Police say they believe she did not die violently.
Investigations into the 33 year fashion designer's death continue after her body was found on a boat in Montauk on Monday.
The Department of Foreign Affairs says it's aware of the case and is providing consular assistance.
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