RedactedNarrative: Victim tried starting her PWC just off her floating dock behind her residence.  Witness (victim's sister) was on the floating dock holding the PWC's bowline.  Witness2 (victim's aunt) was watching from the shore.  The PWC exploded which throwing the victim into the air.  She landed on the top portion of the vessel which caused a fractured vertebra (L1).  The victim then fell into shallow water.  Witness1 got in the water to pull victim onto the floating dock.  Witness1 then went to summon help and subject moved to the floating dock to assist victim  and fend the PWC from the floating dock.  The victim was transported, hospitalized, underwent surgery, suffered a stroke, rehospitalized and died.  The ME connected the death to the explosion.  There was a leak in the fuel line.