We reported on a similar story (before the site update, unfortunately) but it seem the first diving-related death has occurred on the Oriskany.
Updated: The comments section of the Pensacola News Journal article has a post from someone claiming to have been present on the H2O at the time. The details (such as they are) are below.
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Oriskany Float

Yes, we’re still here (although we’ve been very, very busy recently :-( ..) The plans for the early-summer trip fell through, but thats all about to change. We are looking to go to Pensacola over Labor Day weekend to dive the world’s largest artificial reef, the aircraft carrier formerly known as the USS Oriskany. Interested? More details after the break.
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So the forecast isn’t looking that good, but we’re finally on our way to Pensacola to dive with MBT. If the weather improves, we’ll be diving the Oriskany on Sat and Sun. (Bad weather seems to be following us anytime we go to the water – Key West was choppy until we gave up on diving, and there is a small craft advisory for yesterday and today in Pensacola.) I’ve promised more writings and pics, so read on for our trip report so far. (With lots of pics!)

We’re going on a drive. Due to some strange coincidences (and reasonably-timed unemployment) we are at loose ends right now. There is some work to do on the house, but after that we’re totally free. So we’re driving to Florida. Targets of interest are Canaveral (we missed some of it last time due to scheduling), the excellent Ocean Grill (my father worked there as a kid), Key West (never been) and of course, some diving. We’re driving down from the DC/Baltimore area, so we are looking for any suggestions on things to see along the way, places to stay and especially dive locations or shops to talk to. We don’t have a set schedule (thats part of the point :) ..) and so booking ahead more than a day or two is going to be difficult. But, if we are coming your way and you want to get together (or have anything you can recommend), drop me a line in the comments.