Update:
The cause of death was apparently drowning. Not sure what precipitated that. The owner of the business the diver worked for is facing not only OSHA regulation violation problems but the Coast Guard is investigating as well, with an eye towards bringing criminal negligence charges. If that wasn't enough, the dead guy's widow may bring a civil case against him. A lot of this stems from the fact that the diver was technically an employee (not an independent contractor), was given substandard dive equipment by the business owner and was probably in such poor physical condition that he shouldn't have been put in the water in the first place.
On a broader note, based on this incident, it looks as if OSHA is considering developing regulations aimed specifically at the hull cleaning industry. They seem to understand that the regulations written for the hard hat commercial industry are not really applicable to hull cleaners. So while it is a good thing that OSHA may not paint hull cleaners with the same brush as commercial divers, it would mean regulation of an industry that has for decades enjoyed flying under the radar.
