Authorities have publicly identified a 40-year-old construction worker who was killed over the weekend in an accident involving heavy machinery at a work site in the Bay Park neighborhood. Cesar Abarca Carillo of San Diego was struck by an excavator at the construction site on Morena Boulevard near Littlefield Street about 9:30 p.m. Sunday, according to the county medical examiner’s office. Paramedics took the victim to Sharp Memorial Hospital, where he was pronounced dead shortly after arrival, the agency reported.