Porter County Sheriffs Police are investigating a fatal accident. Officials say at about 5 pm Tuesday a southbound 2011 Chevrolet Avalanche went left of center and struck a northbound semi-tractor and trailer head-on. The driver of the Avalanche, identified as 68-year-old Glenn Jennings of Valparaiso, was pronounced dead at the scene. Authorities say the driver of the semi was not injured. The Sheriffs Department Reconstruction Team is conducting further investigation of the crash. Indiana State Police is also assisting with a truck inspection of the semi-tractor and trailer, authorities say. The Coroner's office will conduct standard toxicology tests on the deceased, but Porter County Sheriffs Police say drugs and alcohol are not believed to have been a factor in this crash.