KNOXVILLE, Tenn. (WVLT) -- Authorities have identified the man who was killed in a late afternoon wreck on Alcoa Hwy., near John Sevier Hwy. on Wednesday. Officials believe Kevin McMahon likely suffered from a medical problem right before his Ford Expedition rear-ended a Honda Accord as he was trying to go from John Sevier Highway to southbound Alcoa Highway.

McMahon's SUV bounded off the Accord and into the grassy median before colliding head-on with an oncoming box truck. Witnesses found him unconscious and trapped inside the vehicle. They used a crowbar to free him and were performing CPR when medical personnel arrived and took over. He was taken to UT Medical Center where he was pronounced dead.

His daughter, Elizabeth McMahon, was riding with him. She was also taken to UT Medical Center with what authorities described as non-threatening injuries. The driver of the box truck and his wife, Donnie and Stephanie Ashburn, were also taken to UT Medical Center, as was the driver of the Honda, Macelle Savoy.

Police said the investigation is still ongoing.