Pulled from a blog:
OCGA Sec. 40-6-393 allows for a driver to be charged with vehicular homicide if he "causes the death of another person"
VH is a misdemeanor if the death is caused by what I'll call a "normal" moving violation, e.g. speeding or running a stop sign.
When the predicate offense is a more serious one such as racing or reckless driving (or if someone leaves the scene), it's a felony.
What this means: a prosecutor could decide to indict Carter for two counts of felony vehicular homicide and he could face up to 15 years per count.
This is not to say that is what will happen - the charges were referred to the solicitor who handles misdemeanors, but the solicitor could very well refer the charges up the ladder to the DA.