Emmanuelle

The previous owner of the Nick Harris Detective agency, private eye Milo Speriglio investigated the death of Marilyn Monroe for 19 years. He grew certain that she was murdered by the Mafia, he co-wrote a book about it.
From the Nick Harris website: "Under Milo Speriglio's direction, Nick Harris Detectives continued to receive international distinction. Among their many high profile cases are the mysterious deaths of Marilyn Monroe, Jane Mansfield, Natalie Wood, and George Reeves, the original superman. Other cases include: O.J. Simpson, Michael Jackson, The Hillside Strangler, and Richard Ramirez, the Night Stalker."