thread bump
was trawling a newspaper archive and found this
from Probe Death Of A Beach Boy Daily News New York page 4 30th December 1983 (AP)
"The harbor patrol officer who found Wilson's body said the singer had dived repeatedly into the water during the day, and that might have led to his death.
"When you dive a lot you can hyperventilate; you can actually black out from that," officer John Rochford said. "
full article scan
https://i.imgur.com/nUOzyox.jpg