Her professional dramatic career began when she was cast in the 1988 film Aloha Summer. Her role ended up on the cutting room floor, but her interest in acting had been kindled. Her scientific career was put on hold indefinitely.

Walker became a regular in the TV Series Santa Barbara, appearing as Andrea Bedford. Since then, she has gone on to numerous roles in films and TV series. She is probably best known for her starring roles in Moon Over Miami and Profiler. She has also appeared in the films Singles, Universal Soldier and Happy, Texas.

In September 2007 Ally starred in the HBO series "Tell Me You Love Me".

(wikipedia.org)