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WriterSarah Goldfinger
Eli Talbert
Carol Mendelsohn
Naren Shankar
DirectorKenneth Fink
Original AirdateMay 20, 2004

Bloodlines is the twenty third episode of season four 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 coworker who ends up on the other side of the law.

Main Cast Edit

Recurring Roles Edit

Guest Stars Edit

  • 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 AlsoEdit

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