It began in the 24000 block of Wassail Way around 5 p.m. Sunday.
Sheriff Ed Gonzalez said deputies were responding to a disturbance call involving a husband and wife. The husband was reportedly armed.
When deputies arrived, they found a woman and two teens safe inside the home, but the husband fled. A deputy setting up a perimeter in the area came face to face with the man on Nomini Hall Lane.
Gonzalez says the man pulled a pistol on the deputy, and that's when the deputy shot and killed him.
That deputy was not injured during the incident, which remains under investigation.