Indiana State Police received a 911 call at 1:26 Sunday morning that the truck was in a private pond near the corner of County Roads 75 North and 150 East in Sullivan County.
Two troopers arrived to find the red 1933 Ford pickup rolled on the passenger side in about three feet of water.
Efforts to free the man by the troopers, a State Police diver, and a Sullivan City firefighter were unsuccessful.
State Police believe the truck was east bound on CR 75 when the driver failed to stop at the intersection.
He ran over the stop sign, then went over an embankment into the pond.
State Police identify the victim as 43 year old Richard Enstrom, Junior of Shelburn.
An autopsy is scheduled for Monday morning.
We'll bring you more information as it becomes available.