Peyton Sims,4, drowned while camping when the truck he was sitting in went into a lake in Tishomingo County, according to WTVA.com.
Officials said preliminary autopsy results show that Sims drowned.
The child was camping with his mother, Brandy Lee, and her boyfriend, Bobby Thompson.
Lee and Thompson have posted bond after being arrested and charged with public drunkenness.
NEMS360.com will report more as it becomes available.