Authorities in California searching for missing Virginia man who had planned to climb Mount Whitney

INYO COUNTY, Calif. - A Virginia man believed missing on California's Mount Whitney is an accomplished hiker and marathon runner who has been determined to summit the peak since a failed attempt last year, his family said Tuesday.

Search and rescue teams combed the state's tallest peak on Tuesday for a third day to look for Ling Dao, who was reported missing June 14. Snowy, icy conditions were complicating the search in an area that spanned about 30 square miles (80 square kilometers) of high-mountain terrain, said Carma Roper, a spokeswoman for the Inyo County Sheriff's Office, which is leading the search.

Dao, 41, flew to Las Vegas on June 11 and planned to climb Mount Whitney on June 12 then catch a flight back to Virginia the next day, Roper said. But when he didn't show up for work, colleagues notified the sheriff's office.

Family members said Dao was in excellent physical condition.

"He is an experienced hiker and very athletic. Fitness is his life. He runs marathons pretty much every week," said a sister, Chelley Dao, 25.

Last June, Dao attempted to climb Mount Whitney with his two brothers but only made it halfway up the 14,505-foot (4,421-meter) mountain, said Kimmai Dao, 36, another sister.

"Since then, Ling has been upset about not finishing it. That's why he wanted to do it again," she said, adding that her two other brothers flew out to California to join the search efforts.

The family says Ling had a 1-day permit to climb Mount Whitney and confirmed that he checked in on June 12. The sheriff's office says it has received several reports of hikers who saw or spoke with Dao both at the summit and during his ascent.

According to a Facebook post by the sheriff's office, the rental car company Dao used initially told the office he returned the vehicle June 14, which they later changed to June 15.

The vehicle was located June 15 at a campground parking area, and a search was launched the next day.

"Due to the misinformation provided by the rental agency, our search was delayed," said Chelley Dao. "Our window for finding Ling is extremely small now."

FOX 5's Bob Barnard spoke with Dao's sister, Kimmai Dao, Tuesday. Watch their interview below: