Untamed Heart agent, MGM had greenlighted the project. Originally, the film was titled "The Baboon Heart" in honor of an infant named Baby Fae (born 14 October 1984) who received a cross-species heart transplant from a baboon to fix a congenital heart defect. Initially, Bill had not considered Christian Slater for the role of Adam, “but then it was just the obvious choice." For the role of Caroline, Bill remembered auditioning Marisa Tomei for his earlier film, "Five Corners". While she had been too young for that role, after her success with "My Cousin Vinny" he felt she was right for the
Jack (baboon) was initiated after a concerned member of the public reported that a baboon was observed changing railway signals at Uitenhage near Port Elizabeth. After initial skepticism, the railway decided to officially employ Jack once his job competency was verified. The baboon was paid twenty cents a day, and a half-bottle of beer each week. It is widely reported that in his nine years of employment with the railroad, Jack never made a mistake. After nine years of duty, Jack died of tuberculosis in 1890. Jack's skull is in the collection of the Albany Museum in Grahamstown. Jack (baboon) Jack (died