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 began her career in the early 1980s and first came to attention for playing the role of Siobhan Ryan on the daytime soap opera "Ryan's Hope" from 1982 to 1986.
Relevant evidence: No