Question: What character did Mary Marg Helgenberger portray where she received several award nominations in the CBS police procedural drama?
Sentence (from "Marg Helgenberger"): She is best known for her roles as Catherine Willows in the CBS police procedural drama "" (2000–12, 2013) and the subsequent TV movie "Immortality" (2015) and as K.C. Koloski in the ABC drama "China Beach" (1988–91), which earned her the 1990 Emmy Award for Outstanding Supporting Actress in a Drama Series.
Relevant evidence: Yes