Louis Deherrera was 46 when he was last seen in the San Luis area of Costilla County, Colorado, on August 4, 2013. He was reported wearing a white t-shirt and brown pants; he is described as having black hair, brown eyes, standing five feet seven inches and about 155 pounds. The last known location is the Cielo Vista Ranches area near the community of San Francisco, a remote, rugged landscape that can impede searches.

The Costilla County Sheriff’s Office opened an investigation, but public details about why he was in that area or what happened afterward are scarce. Over the years the case grew cold, and his disappearance is listed among the county’s unsolved files. His name has been included in resolutions for Colorado’s Missing Persons Day as an acknowledgment that he remains unlocated.

If anyone was in or around Cielo Vista Ranches or San Luis on or around August 4, 2013, and remembers seeing Louis or a man matching his description, please come forward with information.