BBC News:
Kirsty MacColl justice campaign to disband The Mexicans stitched up Kirsty's family because the owner of the speedboat is a very wealthy supermarket tycoon in Mexico who clearly paid off all the relevant parties except Kirsty's family to make sure he got off scott free.
A lot of evidence points to the probability that it was the tycoon who piloted the speedboat at speed - ignoring warning flags about divers in the area - in a restricted diving area where Kirsty was swimming just below the surface with her diving gear on.
She was chopped up by the propellor.