Traffic was at a standstill for miles on Interstate 76 Thursday when an accident involving a horse trailer claimed the life of one man, his dog and three horses. The State Highway Patrol has identified the man who died as thirty-one-year-old William Tankard of Aiken, South Carolina. A preliminary investigation revealed that around 3:45 p.m., a semi-tractor trailer was slowing in traffic eastbound on I-76 in the right lane. A passenger car was slowing in traffic behind the semi.