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WASHINGTON -- Nicholas Simmons disappeared from his parents' house in a small upstate New York town on New Year's Day, leaving behind his wallet, cellphone and everything else.

Four days later, an Associated Press photographer, looking for a way to illustrate unusually cold weather, snapped his picture as he warmed himself on a steam grate a few blocks from the U.S. Capitol.

Paul and Michelle Simmons saw the AP photograph in USA Today Sunday morning after it was brought to their attention through a Facebook page set up to help find their 20-year-old son, according to police and family friends.

The photo, taken Saturday by AP photographer Jacquelyn Martin, showed Simmons with his unshaven face pressed against a grate outside the Federal Trade Commission. He wore a ski jacket and a hood over his head. A thick gray blanket covered his lower body.

Martin was assigned to the White House that weekend, but with President Barack Obama still on vacation in Hawaii, she spent the day looking for shots that would illustrate the cold weather. That is how she found Nick Simmons, in an area where homeless people often gather when it is frigid outside. She found a cluster of men huddled around the grate, introduced herself and started taking pictures.

Then she noticed one person in particular, huddled under a blanket.

It struck me how young he was, Martin said. I again introduced myself and shook his hand. He said his name was Nick.

Martin finished shooting, sent the pictures to the wire and then called it a day. The next day, she received a message via Twitter from USA Today.

The newspaper had run the photo of Nick and was contacting Martin to tell her that Nick's family had recognized him and was trying to locate him. Michelle Simmons was certain that the young man in the photograph was her son, missing for four days.

Click here to read more and to watch the report at CBSNews.com.

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