Published: Jan 10, 2012 12:57 PM EST
Updated: Jan 10, 2012 4:15 PM EST

IMMOKALEE, Fla.- It has been three years since Adji Desir disappeared from his grandmother's front yard in Immokalee.  
Investigators in Collier County have continued working with agencies like the National Center for Missing and Exploited Children to keep the search going.

The case has garnered national attention and has been featured on Nancy Grace and in People magazine.

Collier Sheriff's deputies have passed out fliers to neighbors in Immokalee's farm worker's village and nearby businesses, developing thousands of leads over the last three years.

Investigators in the case have said they're worried someone knows something about Adji's disappearance, but is afraid to speak up. But they've kept in constant communication with the other agencies working on the case, hoping one of the leads will solve it.

Investigators have released an age progressed photo of what Adji would look like today. He was to turn nine years old last October.