Police on Monday were investigating the circumstances surrounding the disappearance of a Commack man who recently had a liver transplant.

Sayed David Asghari, 25, was reported missing three days ago, after leaving his Fairfield Way home at 3:30 p.m., Suffolk police said.

"He left without taking his required medication including his antirejection medication," a Monday news release said.

Police said Asghari "may have taken the Long Island Railroad to New York City."

Police described Asghari as Middle Eastern, 5 feet, 9 inches tall, about 140 pounds, with a thin build. He has brown hair and green eyes and "a large abdominal scar from the liver transplant," police said.

"He was last seen wearing a black jacket, black jeans and blue and white sneakers," police said.

Police said Asghari may not be carrying identification.

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Anyone who has information about Asghari is urged to call detectives at 631-852-6194.