Marg Helgenberger is a longtime Hollywood actress, best known for her role as the fiery crime-scene investigator/forensic scientist on the hit television show, CSI: Crime Scene Investigation (CSI: Las Vegas).You don't need to be a certified CSI to solve the mystery of Marg Helgenberger's ever changing face...
The culprits are clearly, a boatload of botox and an extra helping of collagen lip injections.
Its really a shame she decided to opt for plastic surgery, seeing how in 2002 she looked to be aging quite gracefully (with the collagen lips).