I was at Rawlings that weekend and can provide these additional insights
The Victim was found in 50+ ft of water, facedown Regulator out.
The Victim was found roughly 40 ft from Platform 1.
The Water temp at 50 ft was between 54 and 58 degrees
The Instructor did not have a CA
The Victim was wearing a 5m wetsuit, hood, but no gloves.
The Search for the Victim began shortly after 12:00 when a small group of divers (on shore) were notified that a diver was missing. The Victim was found, brought to the surface, and on the Dock by 1220.
Overheard and third party information
3rd party - The Diver was on OW dive 3, had completed the skills, and was beginning the "tour" portion of the dive. The instructor took the 6 students to 50+ feet as part of the tour of the Lake
3rd party - The dive computer showed 880 psi available, the BCD was in working condition, and the regulators worked properly.
3rd party - The instructor and class surfaced at approx 11:25 - 11:30 after completing a 3 min safety stop skill.
Overheard - The cause of death was drowning and a lung embolism.
Overheard - Viz were the Victim was found was near zero (speculation - the group of students had stirred up the silt during the dive)
As someone mentioned earlier in this thread, the investigation is still ongoing by the training agency, once complete I'm sure other details from this fatality will come to light.