Crikey! (somone HAD to do it!)
It is surprising that given his close encounters with so many very dangerous predators, that he ends up being done in by a very rare incident.
Also, agree that it's probaby best it was a ray that got him. He most definitely would not have wanted an animal destroyed for having taken his life. Had it been a croc or some other land dwelling critter, it probably would have been hunted down and killed.
He did have one helluva life...
R.I.P. Steve