Investigators initially suspect two different weapons, but later confirm the assailant used the same dagger. The tip broke off during the stabbing of the second victim (Jessica), and the killer then returned to finish off the first victim (Kevin) with the broken blade.
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Nick Stokes identifies an unusual blood pattern on the instep of Kevin Shepherd’s shoe. Since Kevin was curled in a fetal position, the blood must have come from another source—someone who was "flowing" blood nearby.
The episode follows two distinct investigations that test the team's forensic skills and personal biases:
Amy and Kevin Shepherd are brutally stabbed to death in a parking lot after celebrating their anniversary at a high-end restaurant. Their SUV is stolen, and a witness named Justin Green attempts to help, though the crime scene is severely compromised by heavy rain shortly after the CSIs arrive.