Cary Police said it happened at N. Harrison Avenue and NW Maynard Road.
Several people were injured when a vehicle struck revelers at a parade celebrating the Lao New Year on Saturday in rural Louisiana.
Police have not released the person's name and have not said whether any arrests have been made.
Michelle and Coy Henderson said they are grateful their son is alive, but they want answers and accountability.
The deputy was responding to a 911 call for a missing person when the collision happened.