The Florida Highway Patrol said Michael Graziano, 23, was riding in a car that hit the rear of a dump truck it was attempting to pass, the Tampa Bay (Fla.) Times reported.
The driver of the car, Cameron Bosley, 24, was seriously injured.
Michael Graziano's brother, John, suffered a broken skill in 2007 when the teenage son of wrestling star Hulk Hogan lost control of his Toyota and crashed into a palm tree in Clearwater, Fla.
The Iraq War veteran was hospitalized for two years before he was released in a minimally conscious state.
Last year John and Michael's father, Edward Graziano, was sentenced to 10 years in prison for plotting to kill his wife.