The patrol reports a truck driver was seriously injured after suffering from a medical issue.
Thirty-year-old Kelvin Adcock of Butler was taken to Cameron Regional Medical Center.
The accident happened Saturday morning four miles south of Cameron on Interstate 35 when the medical issue occurred. The southbound truck went off the right side of the road, hit an embankment, overturned, and came to rest on the passenger side of the truck.
The Freightliner was demolished and Adcock was wearing a seat belt.