The Smith County Sheriff's Office says the body of Jake Kimbley was located Wednesday morning near Winona.
Justice of the Peace Mitch Shamburger told KLTV-TV (bit.ly/Ng8u35) that the body was in a septic tank. Further details were not immediately available.
Investigators say Jake was playing with another child Tuesday afternoon when he turned up missing in a wooded area. Searchers on foot and using horses spent the night looking for the child. His body was located about 12 hours after the disappearance.
The sheriff's office and Shamburger did not immediately respond to messages Wednesday afternoon from The Associated Press.
Winona is about 100 miles southeast of Dallas.