Anytime the word "aggravated" is added to a criminal charge, it is because police have determined that the crime has elements that raise its level of seriousness. If authorities have charged you with aggravated assault, they must have felt the circumstances qualified you for the higher felony charge rather than a simple assault charge.
Thousands of fatal accidents happen each year across the country, including many in Tennessee. Many of them are simply tragic accidents, but some are more than that. Upon conducting an investigation into a fatal crash, law enforcement officials may discover that certain factors make the accident a crime.