ST. PETERSBURG — The city’s sanitation director died on Thursday after suffering a medical episode while he was driving his personal vehicle, according to St. Petersburg police. Benjamin Shirley was pronounced dead at a hospital, police said. He was 68, and spent 48 of those years working for the city. The incident took place shortly after 4 p.m. Shirley was driving his pick-up truck south on 31st Street S when he veered off the road near the 300 block and struck several trees and a power pole wire, police said. No other vehicles were involved. Police said 31st Street S is closed to traffic between Third and Fifth Avenues S while Duke Energy crews fix the downed pole.