Investigators Charles Rappleye and Ed Becker have published the book All American Mafioso: The Johnny Rosselli Story.
The authors state that “Jeanne Carmen was a neighbor and close friend of Marilyn Monroe” during the period before Monroe’s death in 1962.
Rosselli was a friend of Carmen’s and Monroe’s and Carmen saw Rosselli at Monroe’s apartment on Doheny drive on “several occasions”.
Carmen once asked Monroe how she came to know Rosselli and Monroe stated that she “knew Johnny through the Kennedy’s”.
Source: ^ Rappleye, Charles; Becker, Ed (1991). All American Mafioso: The Johnny Rosselli Story. Doubleday, 209. ISBN 0-385-26676-6