Marilyn later falls pregnant and gives birth to a son, Byron Vincent, named after Vinnie Patterson (Ryan Kwanten) who illegally sped through traffic to get Marilyn to hospital. After suffering from post-natal depression and left Donald alone with Byron. When Marilyn returns a few months later, she feels inadequate as Donald has hired Nanny Ellen Porter (Anne Grigg) but later grow to love Byron. This is only to last a few months as Byron is diagnosed with cancer. The Fishers leave with Byron for America to get treatment, but Byron later dies. Marilyn, unable to cope, leaves Donald and he returns to Australia alone.