An Associated Press investigation has revealed that the quality of medical care at Rikers Island has been cited in the deaths of several inmates.
Public records obtained by the AP show that 15 inmates died in the past five years as a result of poor medical care or lack of treatment.
The records include instances in which sick inmates were ignored or denied medication, or were uninformed about their side effects.
Medical care at Rikers is provided by an outside company called Corizon Health, which is now under scrutiny by the mayor's office.
Right now, it has a three-year, $126 million contract with the city.
The Department of Correction says improving inmate care is a key part of the commissioner's plan to make the jail safer.
The department has also been scrutinized recently for the deaths of two mentally ill inmates, one who was left in a scorching cell and another who was locked up alone for seven days.