• Husband: Actor Alan Rosenberg (married September 9, 1989, who has a semi-recurring role as lawyer Adam Novak on the show)
• Son: Hugh Howard, born on October 21, 1990
• Pet: a dog named Momo (deceased)
• In laws: Mark Rosenberg, Paula Wienstien
• Niece: Hannah Rosenberg
• Father: Hugh Helgenberger
• Mother: Kay Snyder
• Brother: Curt Helgenberger
• Sister: Ann Helgenberger

• When she comes home from the set of CSI she plunges into homework and housework and gets involved with her son Hughie's school activities.

• Marg has been actively involved with the fight against breast cancer and other charities for several years now.
• Teamed up with "Women's Voices, Women Vote" for a PSA campaign that encourages women to show their strength in numbers at the polls.

• She once had a job as a weather girl at a TV station in Nebraska, and her name was shortened to Margie McCarty. (McCarty is her grandmother's last name)
• Marg played the french horn in her high school (North Bend Central High School) marching band.
• Marg can also play the piano.
• Started working in the soybean fields at the age of 11
  
• Worked part-time in a meat packing plant while a teenager.

Marg loves the song "Babylon Sisters" by Steely Dan for the lyrics "Drive west on sunset to the sea" which she and her husband Alan did on their first date.

• She's the object of adoration of Buddy in Mark Heath's "Spot the Frog" comic strip.
• 
  
• Was named one of People Magazine's 50 Most Beautiful People and

Esquire magazine's Women We Love in 2002

• Is number 4 on TV Guide Magazine's Sexiest Stars on TV for 2007. (Source)
• Marg is #41 on Entertainment Weekly's "The EW 100 Stars We Love Right Now" in summer 2007.
• In 2008 Marg joined the ranks of the celebrities who sported the famousmilk mustache, as she was chosen as an endorser of the Got Milk? campaign.
  
• Local officials of North Bend Nebraska renamed Locust Street into Helgenberger Avenue when the actress went home to celebrate the little town's 105th anniversary in the summer of 2006.
• Six years before CSI, she and Gary Dourdan starred together in a TV movie called Keys (1994).
• CSI co-star Gary Dourdan's nickname for Marg is "Margalicious”.
• During breaks on the CSI set, Marg and her co-stars Jorja Fox, Gary Dourdan and Robert David Hall jam together and play different musical instruments.
• Marg is known for throwing great parties.
• Her Hollywood home once belonged to silent movie star William S. Hart
• Middle of 3 children. Her older sister is Ann Helgenberger (jazz musician) and her younger brother is Curt Helgenberger (a meat inspector).
• She was a huge fan of the TV show Mission: Impossible when she was young.
• Her mother, Kay, is an Irish American and her father, Hugh, was a German American.
• Meet husband Alan in 1984 and they started dating in 1986.
• Daughter of Hugh Helgenberger, who was a meat inspector, and Kay Helgenberger, who was a nurse. Marg originally wanted to be a nurse like her mother.
• Sister-in-law of Mark Rosenberg and Paula Weinstein.
• In her personal life, Helgenberger is the daughter of a cancer survivor and is very active in supporting research for breast cancer.
• Marg's production company "Don't Call Me Marge!" is her humorous jab at people’s mispronunciation of her name.
• On March 2007 Marg was named one of the sexiest TV stars of 2007 by TV Guide Magazine.
• Until she went to college, Marg wanted to be a nurse like her mother.
• At one time both Marg and her husband Alan Rosenberg had successful series on CBS. Marg: CSI (2000 – present) Alan: The Guardian (2001 - 2004).
• Was on the list of VH1's 40 sexiest stars over 40.

• Her birth name is Mary Marg Helgenberger.