SHENANGO TWP., Mercer Co., Pa. - The Mercer County Coroner says a cardiac problem is to blame for a deadly semi crash on I-80.

Around 11:15 a.m. crews were called out to reports of a crash at the 1-mile marker just over the state line into Pennsylvania. 

According to a release from PSP, 53-year-old Wayne Grahl was traveling west on Interstate 80 toward Ohio when he went off the roadway. 

Initial reports indicate the truck may have caught fire for a short period of time. 

Pennsylvania State Police say Grahl's truck overturned when he struck a ditch. 

The coroner says the "cardiac event" is what caused the man's death.

PSP is still investigating.