"Without A Trace" had a large cast, including:
* Poppy Montgomery as Samantha "Sam" Spade
* Enrique Murciano as Danny Taylor
* Roselyn Sánchez as Maria "Marty" Martinez
* Eric Close as Martin "Marty" Fitzgerald
* Anthony LaPaglia as Jack Malone
If you could clarify which actress you're thinking of, I might be able to help you find information about their health.
However, it's important to remember that an actor's private health information is generally not public knowledge, and speculating about it is inappropriate.