Hopefully the trial will give some answers. I suspect that she was murdered.
This is from a news article and OP on Page 3:
Oddly, around her body were hydrangea flowers and leaves. Marianne Shockley's boyfriend, Marcus Lillard, explained to investigators that the hydrangea debris got there when, while trying in vain to resuscitate Shockley, that he and Clark Heindel shook the flowers over her body “for some kind of ceremonial” rite, Michael Maybin, the GBI agent, testifed. “That’s what they were doing instead of calling 911,” the agent added. “I think (Lillard) said it was something Clark was into or something, some type of ritual, that he had been to South America and learned that stuff from some kind of religion.”
They didn't call 911 for 45 minutes.
This post is from OP on Page 2:
“I asked Lillard if he went behind the diving board when he carried Shockley and he stated he actually grabbed her from the hot tub and jumped in the pool and swam with her to the other side,” according to Baldwin County Sheriff’s Office Deputy Sgt. Andrew Brantley. “Lillard stated that they (he and Shockley) exited the pool in the shallow end and he dropped her there.”
The homeowner killed himself.