Johnson's daughter, Trina Johnson-Pettiford, of Fort Lauderdale, could not be reached for comment but has filed a civil lawsuit against McGowan and the driver of a tractor trailer that investigators say was the second or third vehicle that struck Maebell Johnson and dragged her along the highway. The tractor trailer driver was the only involved driver who remained at the scene. Investigators said it's impossible to say which of numerous injuries killed Johnson, or which driver.