A month ago, a man died after walking into a hospital on Staten Island. Officials are trying to identify him.

STATEN ISLAND, N.Y. — The identity and cause of death for a man remains a mystery more than a month after he walked into a hospital on Staten Island.

The man became unresponsive and died on Aug. 20 after he sought medical care at an unnamed hospital on the borough for symptoms that included pain in his abdomen and chest, according to the National Missing and Unidentified Persons System (NamUs) website.

The cause and manner of death are pending further study, according to a spokeswoman for the Office of the Chief Medical Examiner (OCME).

Photos of the man were posted on the NamUs website.

The medical examiner is looking into tentative names of Hirberto Martinez, Gilberto Martinez, and Gilberto Martinez-Merlin as part of the effort to identify the man, according to the office’s spokeswoman and the NamUS website.

However, those possible names have not been verified and next of kin have not been notified.

Described as Hispanic or Latino, the man’s estimated age was 30 to 40, and he stood 5′3″ tall and weighed 170 pounds. He had brown eyes and black hair on his head and in his mustache and goatee.

A spokeswoman for the NYPD referred the Advance/SILive.com to the M.E.’s office for information about the man.

NamUs lists at least 25 people who remain unidentified on Staten Island.

“By bringing people, information, forensic science, and technology together, NamUs helps resolve missing, unidentified, and unclaimed person cases nationwide,” according to the mission statement on the website.