Equipment malfunctions do not kill people.
Peoples reaction to their equipment malfunctioning is what kills them.
God bless the guy, but there's no way a diver with 30 dives should be doing a 100 foot dive in the cold water of Tobermory for his first dive of the year. Only he and God know what really happened, but any equipment 'boo - boo' can add an exponential amount of stress.
I was diving tonight with Groundhog246 (and his lovely wife) in a local quarry. Max depth, 25 feet - perfect for skills training, etc. Halfway through the dive, his mouthpiece falls off. He calmly reached for his octo and kept going. I didn't even realize anything happened until later when I noticed he was breathing off his octo.
My point is - say that happens at 75 feet. Groundhog246 didn't worry about it because hey - it's 25 feet. Worst case scenario, he's doing an ESA. No big deal. He was in warm, familiar waters, and he totally didn't panic. But he KNOWS now that he needs to repair his mouthpiece - and it's not likely to happen again.
If Groundhog had gotten into 110 feet of freezing water and felt his mouthpiece fall off because he had a bad zip tie or whatever, he's facing a lot more stress. A lot more stress leads to increased respiration, your heart is working harder, your panic level starts to rise - BAM.
(Sorry Kent - I hope that NEVER happens!
)
That being said - hey, I don't know. Maybe it was something that could have happened at that exact moment, whether he was in 100 feet, 10 feet or asleep in his bed. We don't know, and I'm not making assumptions in this particular case.
I do take offense to the notion that equipment failure is somehow 'accepted' as a reason to have a dive accident.