1,666 Pages

WriterSarah Goldfinger,
Eli Talbert
DirectorKenneth Fink
Original AirdateMay 20, 2004
Previous Episode: No More Bets
Next Episode: Viva Las Vegas

Bloodlines is the twenty third episode in season four finale of CSI: Crime Scene Investigation.


The CSIs investigate when a casino employee is beaten and raped on her way home from work. The victim identifies her attacker, but the DNA evidence suggests that he is not the person responsible. Later, Grissom has to help out a Sara Sidle who ends up on the other side of the law when found but not charged for a DUI.


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Main Cast

Guest Cast

  • Alex Carter as Detective Louis Vartann
  • Joseph Patrick Kelly as Officer Metcalf
  • Ty Upshaw as Officer T. Brantley
  • Nina Siemaszko as Linley Parker
  • George Newbern as Dr. Todd Coombs
  • Lisa Sheridan as Crystal Coombs
  • Mark Kiely as Roger Coombs
  • Michael Reilly Burke as Bailey Coombs
  • Drew Pillsbury as Larry Coombs
  • Rachel Winfree as Psychic Patient Janet
  • Edmund Wyson as Officer Devine


  • Dr. Todd Coombs has a condition called Tetragametic chimerism which can cause a person to be different DNA in their body, for example, the semen would be different from their saliva. As Gil Grisson eventually found out when he get a look at the back of Dr. Todd Coombs.

See Also

CSI:Las Vegas Season 4
Assume NothingAll For Our CountryHomebodiesFeeling the HeatFur and LoathingJackpotInvisible EvidenceAfter the ShowGrissom Versus the VolcanoComing of RageEleven Angry JurorsButterfliedSuckersPaper or PlasticEarly RolloutGetting OffXXBad To The BoneBad WordsDead RingerTurn of the ScrewsNo More BetsBloodlines