Mid-morning Thursday, March 2, Ron Hatch took his parents, Paul, 88, and Dorothy, 86, for a ride. Their destination was the 91 Freeway. To visit a sign. This was no ordinary freeway sign, but one of two recently installed by Caltrans on the 91 that pay homage to Paul and Dorothy’s son, Jerry Hatch, the Fullerton PD officer who lost his life on June 30, 1975, when he was struck by a drunk driver. Officer Hatch was on his way to work when he pulled over to help a disabled motorist and he was struck and killed. He was 23,…