The author of a new investigative book about the killings of former President John F. Kennedy and actress Marilyn Monroe said the evidence he’s uncovered demand that Congress reopen its investigation into the slayings. In his book Collateral Damage, legal analyst Mark Shaw, an expert in killings, fingers the mob and the Kennedy clan in the killings and also that of famed reporter Dorothy Kilgallen. Shaw, using newly uncovered documents and fresh interviews, stitched the deaths together and puts the blame on Robert F. Kennedy for the deaths of all three. His theory in the book previewed for Secrets: RFK...