Mourners gathered around candlelight in Cambridge Saturday night in a somber vigil for the National Grid worker killed when a hit-and-driver barreled into a worksite earlier this month. HUNDREDS of people showed up to the #Vigil for Roderick Jackson, the National Grid employee. Roderick Jackson of Cambridge was working with a National Grid team on Totten Pond Road when prosecutors say 54-year-old Peter Simon, of New Hampshire, veered his pickup truck into the work area, hitting and killing him, as well as 58-year-old Waltham officer Paul Tracey.