Investigators Seek Tips in Missing Person Case

Investigators are asking for tips in the case of a missing adult.

In early October, the Larimer County Sheriff’s Office received a report of an abandoned vehicle in an Estes Valley residential area. Deputies responded and found the GMC Sierra parked in the 700 block of Goblins Castle Road. The GMC was registered to Mark Thiebaut Jr., 28, of Grand Lake. Deputies determined that he had rented a nearby vacation home, which had since been occupied by new visitors. Through further investigation, they spoke to members of Mark’s family, who shared concerns about his welfare and said they had not heard from him in over a week. 

Investigators confirmed that Mark parked his truck in the neighborhood in early October, but have found no other indication of where he may have gone. They did not find any evidence of foul play. LCSO Investigators, Emergency Services personnel, Patrol Deputies, Larimer Regional All Hazard/Crisis Response team, Larimer County Search and Rescue certified volunteers and trained search dogs, and UCHealth TEMS medics conducted a coordinated search of the surrounding area but did not locate Mark. 

Due to the lack of information about his potential whereabouts or intended travel, search efforts were suspended. However, investigators will resume follow up on any leads should additional information become available.

A photo of Mark is attached. Anyone with information about his location or intended destination should contact Investigator Brent Manley at 970-498-5336.