Morris Engelberg, — Joe Dimaggio’s long time “business advisor, attorney, and confidante during the last 16 years of the ballplayers life” — has published the book Dimaggio: Setting The Record Straight.
Engelberg states that Carmen was “a longtime friend of Marilyn’s” and that Carmen “didn’t agree with the suicide theory”.
Engelberg says that Carmen had “warned Marilyn” about her “gangster friends”, “especially Johnny Rosselli” because of his close ties to Mob boss Sam Giancana
Source: ^ Engelberg, Morris (2003). Dimaggio: Setting The Record Straight. MBI Publishing Company, 279-80. ISBN 0-7603-1482-9