TRUCKEE, Calif. — A private investigator is looking for clues in the mysterious disappearance of a local man and longtime ski instructor who vanished more than a month ago.

Mikhail “Michael” Kharshan, 55, of Truckee, disappeared Jan. 31 near Boreal Ski Resort, and has not been seen since, officials said.

Kharshan, a long-time ski instructor at Alpine Meadows Ski Resort, intended to hike the area with friends, said Jeff Rogers, a private investigator with Clear Blue Investigations, who was hired by the Kharshan family. After taking a taxi to the Boreal Castle Peak turnoff, Kharshan wasn't seen again. Rogers said suicide is unlikely.

Kharshan was carrying a backpack and snowshoes at the time of his disappearance, Rogers said. He left a note for his wife, Kate, before his disappearance, and law enforcement conducted a search investigation in early February.

Nevada County Sheriff's Office Det. Mike Sullivan of the Major Crimes Unit said the investigation has concluded and there are no current leads.

“The person is still actively outstanding,” Sullivan said.

Kate Kharshan, whose full-time residence is in Lafayette, Calif., said she knows “absolutely nothing” about her husband's current status.

“I really have no idea about his whereabouts,” she said. “He was never found by search-and-rescue people.”

Rogers said law enforcement called the disappearance “voluntary.” Anyone with information can contact him at Clear Blue Investigations at (530) 386-6990 or the Major Crime Unit at the Nevada County Sheriff's Office at (530) 265-1471.