"These cases were diagnosed weeks ago, and the source has been eliminated," Dr. Alister Martin, the New York City Department of Health commissioner, said.
The health department says these are not new deaths or new cases. At least one of the patients died weeks ago, the commissioner said.
Martin also said there have been no new diagnoses or symptoms in more than three weeks.
The Health Department will continue to monitor for anyone who may have been sickened, including one person who remains hospitalized, he said.
They also said the investigation into the impacted cooling towers continues.
"My thoughts and prayers are with their families and loved ones as they grieve these heartbreaking losses. Nine people have now tragically lost their lives in connection with this devastating outbreak," City Council Speaker Julie Menin said.
An attorney said his client is a 92-year-old man who died earlier this week after being hospitalized for at least three weeks.
Attorney Ronald Katter is representing 10 Upper East Side residents who were sickened in the outbreak.