He was driving down Tribrook Drive in Vista late in the afternoon when he saw a 17-year-old girl running toward him.
"She yelled, 'my Dad just collapsed' and I immediately stopped and called for an ambulance," he said. "I grabbed the defibrillator and oxygen from the police car."
While a neighbor consoled the high schooler, Ritchey was able to roll the man, in his 60s, over onto his back and check for a pulse. When he felt nothing, he hooked up the defibrillator and with one shock was able to bring the man's pulse back.