LEADORE -- The National Center for Missing and Exploited Children has released an age-progressed photo of an Idaho toddler who was reported missing during a family camping trip in Lemhi County in 2015.

The new composite photo shows what DeOrr Kunz Jr. may look like today, at four years old.

DeOrr's parents told authorities the boy disappeared from a campsite near Leadore July 10, 2015. Searchers have repeatedly combed the campground and nearby forest and reservoir, but no trace of the child has been found.

MORE: Lemhi County sheriff: DeOrr's case 'has to be a homicide'

No charges have been filed in DeOrr's disappearance, although then-Lemhi County Sheriff Lynn Bowerman told KTVB he believes the boy was killed. DeOrr's parents, Jessica Mitchell and Vernal DeOrr Kunz, have been named as suspects in his disappearance, and have been "less than truthful" with investigators, Bowerman said.

Both Kunz and Mitchell have denied harming their son.

RELATED: Searchers will return to campground where DeOrr Kunz Jr. went missing

Current Lemhi County Sherriff Steve Penner announced this month that investigators will return to the campground again to continue the search for clues.

Anyone with information about what happened to DeOrr is urged to contact the Lemhi County Sheriff's Office.