Well the story states Steve was swiming with the rays, granted it does not mention if he was forced to do so but being that he films a TV show about being close to animals and gets paid well to do it I will assume he made the decision to place himself in the water. I would think the accounts of the incident would note if he was under duress and being forced at speargun point to swim with the rays.
Do you have info that Steve was forced to go into the water against his will?
Again, neither the police, coroner or family has issued any statements about the circumstances. You were given a link to a post with info given to a Freeper. We don't know for certain WHAT happened other than he was stung in the heart by a stingray.
You have also been given links that show that he was safer swimming with a stingray than you are driving home from work. If you wish to ignore facts that's your choice.