One person was killed Monday morning when a helicopter crashed in a field in the East County community of Potrero, north of state Route 94, officials said. Cal Fire officials were notified of the crash just before 11:20 a.m. The helicopter went down near Round Potrero Road in a rural area near farmland, said Cal Fire Capt. Mike Cornette. One person was killed. No one else was on the helicopter when it crashed, he said. The crash did not spark a fire. No other information was immediately available. Cornette said officials were trying to determine who owned the chopper.