Actually when Kennedy got back to his "bungalow" his "phone" apparently made around twenty or so calls (I think the number may be higher like in the 30's). In addition Teddy made a point to go to the motel manager and complain about noise from a nearby room and to ask the time (Alibi City) so he was anything but asleep. They had a different plan but eventually decided to not play it out but go with the risky strategy of negligence. With some local officials help he (they) got away with it. Luckily, despite the 1980 Dem Convention, it proved the factor that never allowed him to become President. Thank GOD!
And remember that Kennedy money and lawyers prevented the inquest into her death from ever being completed. They demanded to be able to cross examine every witness, and they eventually gave the girl's family money.
Teddy showed up at the police station teh next day showered, sobered up, cool as a cucumber, with the girl still at the bottom. Totally disgusting.