Thank you. I did not know of this.
It is obvious by Jackie's behavior that Marilyn had gone too far in singing to JFK at Madison Square Garden. I think, in fact, that was her death sentence.
Marilyn was surrounded by Kennedys at the time of her death, including Pat Newcomb, who had a connection to RFK. https://en.wikipedia.org/wiki/Patricia_Newcomb
I don't think this is just a series of odd coincidences.
Ironically, the address of Marilyn's first modeling agency, the Blue Book Agency, was at the Ambassador Hotel...
https://calisphere.org/item/e0decccef64b939cb8d2d1078d207397/#:~:text=This was known as the,poolside at this very site.