Mary Margaret Helgenberger is an American actress. 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 ...

CSI star Marg Helgenberger on reprising her role 04:01. NEW YORK -- "CSI" is considered one of the most popular shows of all time. A large part of the show's success was because of its beloved ...

Mary Marg Helgenberger (born November 16, 1958) is an American actress. She began her career in the early 1980s and first came to attention for playing the role of Siobhan Ryan on the daytime soap ...