Mount Sinai needs all the good publicity it can get.
Mount Sinai said the cause of death was congestive heart failure, according to his brother.
"Mount Sinai has made a lot of mistakes," she said.
Mount Sinai continues to hold his job, but he must decide in the next few days whether to tell them to find a replacement.
Mount Sinai is also searching for a chief executive and a dean to run its medical school.
Mount Sinai spent more than $20 million on care for the poor last year.
By that time, the boy had been at Mount Sinai nine months.
Recently, many private communities have been built in Mount Sinai.
"Mount Sinai is a long way from announcing anything," the statement said.
But he is expected to stay at Mount Sinai for another two months.