I sort of remember the part that little Teddy waited till he slept it off before he reported it. You seem to be a troll!
I think the reason he waited was to get the alcohol out of his system. As I recall, he had had a few past DUI's, due to that, it would have been an automatic murder charge for her death had it been found he was DUI.
The book was a best seller in the early 1970's and for a time actually had the Kennedy Clan threatening bookstores to keep it off their shelves. It effectively convinced Teddy to put off his 1972 planned presidential run until 1976, which he then again postponed until 1980, when he was again unable to get traction against the limp-wristed Jimmy Carter in the primaries!