To play rock legend Jim Morrison in Oliver Stone's 1991 movie The Doors, Kilmer started with the music, learning how to sing 50 of the band's songs. He reportedly spent hours in the studio poring over Morrison's vocal performances and watching endless footage of Morrison's interviews to get a sense of his personality and mannerisms.
On set, the cast and crew referred to him as Jim, and many claimed by the end of filming they were unable to tell the difference between Morrison's singing voice and Kilmer's. But when filming ended, Kilmer claimed he had to go to therapy to get Jim out of his system. Rock producer Paul Rothchild, who knew Morrison, claimed that Kilmer "knows Jim Morrison better than Jim ever knew himself."
Ferri, J. (2017, June 4). Actors Who Were Never the Same After a Role. Retrieved from www.looper.com