The Graham man was hit and fell to the ground. Deputies gave the man first aid, but he died at the scene.
Authorities did not immediately identify the family, however, police say the man had a history of assaulting his parents and has threatened to kill them.
According to his parents, the man had a history of methamphetamine abuse, a mental health diagnosis and refused to take his medications.
His mother filed for a temporary protection order, but deputies had not yet been able to locate him and serve him with the order.
It is not yet known how many deputies fired. The deputies who fired will be placed on paid administrative leave, as is standard procedure.
The investigation is ongoing.