actually, i had that book on the bookshelf right beside my computer desk LOL
(in a pile of "cause of death" books, forensics books and true crime books... i was a criminology major and i kept them close LOL)
noguchi's COD: accidental downing (as a result of the heavy jacket specifically)... with "intoxication... one of the factors involved in the fact she was unable to respond well to the emergency after she was in water" (p. 31). he believes she would have known to take off the heavy jacket if less intoxicated. he also says he tried to "soft pedal" (aka tone down) the fact that alcohol played a part in her death b/c he didn't want the criticism he'd seen/experienced when other celebs had been reported as dying from drugs/alcohol.
also, noguchi states that both he and the police did not suspect foul play but by nightfall that sunday "hollywood was alive with rumors" (p. 24).
any other questions - let me know!!