Matt Burton, of the Serious Organised Crime Agency in the North West, said the Fitzgibbon family "revelled in their notoriety":
What we're talking about here is a family who have held a very tight rein on areas of Liverpool for quite a number of years. They thought they were untouchable.
Their motive? Financial greed, and greed in terms of their status and notoriety.
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His mother Princess Diana was killed in a car crash in Paris in 1997 when he was just 12 and his brother William was 15.
The 21-year-old, who was arrested on Sunday, also allegedly injured two other people in the attack in the German city of Reutlingen.
She was going to the aid of a family member who got out of the car in the middle of the park and was dragged away by a different tiger.