An elderly Florida woman backed out of a parking space into a crowd of pedestrians, killing three senior citizens, authorities said Monday. Doreen Landstra, 79, of Bradenton, Fla., began backing out of a handicapped parking space with her Chevrolet Tahoe sport-utility vehicle after church late Sunday morning at Sugar Creek Country Club, the state Highway Patrol said. The rear of the SUV struck seven pedestrians standing in the parking lot, it said. Margaret Vanderlaan, 72, Wilhemina Paul, 70, Johanna Dijkhoff, 80, were killed. Four other people were treated at hospitals. It was unlikely that Landstra would face charges, according to a state trooper.