I think that Peter Lawford was deeply involved in helping to cover up what took place the night marilyn died.
Bobbby Kennedy had visited Marilyn earlier in the day and a huge row had ensued.His appearance at her house was witnessed by several people including Mrs Murray.He was seen returning later that night at about 9 pm with two other men, one of whom as carrying a briefcase or medical bag of some sort.There is enough doubt as to what he was doing at her house for a full investigation to have taken place, but unfortunately for Marilyn, the L.A. police hierarchy were totally under Bobby’s control and he had plenty of friends in high places to make sure his involvement was quickly covered up.I’m sure that Lawford was pivotal to this cover up and that Greenson was gagged too.