How to help To help and to send in tips, go to aubreysacco.com.

A photograph of a man who may have more information on the whereabouts of a missing University of Colorado graduate is making rounds on the Internet.

The photo, taken at a café in Darjeeling, India, shows a white man wearing a powder-blue collared shirt sitting at a table with a Pepsi bottle in front of him.

Paul Sacco said he found the image on his daughter Aubrey’s laptop in May 2010, a few weeks after she vanished in Nepal.

“I want to emphasize that this guy is not a suspect. We just know that she took the photo of him, so why wouldn’t he surface? Why wouldn’t he say something?” he said. “He’s a person of interest just because we don’t know who he is.”

Mitch Miller, an American whom Aubrey met while traveling in South Asia, told the family’s investigator last year that he had seen the man at a hotel in Kathmandu. Sacco said he believes the man must know something about his daughter because it appears they were in the same Nepalese cities around the same time.

Aubrey Sacco, then 23, was last seen eating lunch at a hotel in April 2010 before hiking alone through Langtang National Park at the base of the Himalayas, just north of Kathmandu. Her parents reported her missing after she failed to check in with them on April 29.

“It isn’t even losing the child that is as bad as not having a system in place to find her. That’s worse. It’s horrific,” her father said. “It’s just a parent’s worst nightmare.”

A 2009 graduate of CU, the Greeley woman had spent the previous five months volunteering and teaching yoga, English and art in India and Sri Lanka.

In August, Paul Sacco, his wife, Connie, and their son Morgan, 21, traveled to Nepal for several weeks, where he said the army and police force promised to renew their investigation into Aubrey’s disappearance. Shortly after returning to the U.S., the family learned the Nepalese government had undergone radical changes.

“They don’t have a very good focus because of all their political turmoil and corruption, so there’s always something that’s just in the way of finding poor Aubrey,” Paul Sacco said. “You call the (Nepalese) police for over a year and a half and there’s never a serious crime investigation done to look for your loved one. It’s unimaginable.”

Connie will return to South Asia for several weeks in January to continue searching for her daughter.

At home in Colorado, Aubrey Sacco’s family and friends are turning to social media for help. Earlier this year, several thousand people, including strangers, sent nearly 8,200 Facebook messages to Secretary of State Hillary Clinton in an effort to get her involved with Aubrey’s case.

“We’d love to get her attention and put Americans on the ground in Nepal,” said Paul Sacco, adding that his family has not yet heard a response from Clinton’s office. “We’d love to get Nepalese police to investigate several stories (possible witnesses) have changed.”

Without their help, finding Aubrey will be much more challenging.

“You can’t just go into a foreign country and investigate suspects. That’s against the law,” he said. “If you can’t get their police to investigate, who will do it?”