A simple web search would save you the appearance of being a troll. The lady that drowned was both inexperienced and badly trained, to the point she should not have been certified.
starbulletin.com | News | /2006/05/25/
Her rental deflator was broke/jammed so that air added to the BC came right out. If she were horizontal with the deflator below her the BC would have held quite a bit of air. Instead she was vertical at 10' struggling to swim to the surface (without ditching weights), spit out her reg, swallowed water and drowned at a 30' deep dive site, with 2 functional regs and a nearly full tank (IIRC).
There was no overhead and the guide/instructor did not guide her into anything because this was the initial descent.
The family lawyer went after the manufacturer, distributor and dive shop. Even though many thought the dive shop could have defended themselves, it would have been months of bad press, so they settled (with the other defendants).
Can't see how this incident has anything to do with this thread.