CSI goes after a serial killer whose signature is related his extra "Y" chromosome, once believed to be the "killer gene."



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Episode cast overview, first billed only:
Alexis Dawson
Travis Peck
Rita Bolton


Shelly Seaver is stabbed to death after a violent struggle and marked with a carved bloody Y, the MO of a Boston serial killer. A similar knife belongs to motor-rider Travis Peck, but it's the wrong size. Traces under Shelly's fingernails of a fish species common in Boston and scratches allow Horatio to find fisherman Lucas Wade, who even has the alleged 'criminal gen', an XYY chromosome. While Lucas is in custody, a new Y-carved victim is discovered by her brave young son Arthur, but soon found not quit identical, and traced to Lucas' logical accomplices. Meanwhile Ryan has a hard time with another part of his past, and Eric with jealousy when Calleigh dates a handsome lawyer. The Wade story proves more complicated... Written by KGF Vissers

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Release Date:

14 May 2007 (USA)  »

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Sound Mix:

| (Dolby 5.1)


Aspect Ratio:

1.78 : 1
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Did You Know?


The biker is supposed to be loosening the lug nuts on the prison van but is shown turning them clockwise. This would tighten them. See more »


Performed by Will Dailey
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User Reviews

No Blockbuster Finish This Season
14 December 2007 | by (United States) – See all my reviews

After last season's spectacular finale, leading to Horatio headed down to Rio to begin tracking down the murderer of his newlywed, I was expecting another blockbuster finish. However, it was just a routine show; nothing out of the ordinary.

This opening scene was a surprise as we see two women being offered a ride outside a nightclub by some mysterious biker. One girl takes the stranger up on the offer while the more reasonable - and sane - says, "no thanks." The next day, however, the smart girl is discovered dead and there is no hint of a murder weapon at the crime scene. It turns out she wasn't so smart, taking another offer for a ride and paying for it dearly. It is a very bloody scene. It appears the killer took his tools of the trade to the crime and left with them and there are two were two knives used on this woman. One of them was post-mortem, with Horatio hoping that was some sort of signature which could help his trace this sicko.

Some of the story revolves around just that: the signature indicating the killer had an extra "Y" chromosome which used to indicate - falsely, as it was proved in later years - that someone was "born to kill," hence the title of this episode (which is one of the more grisly ones I've seen.)

Meanwhile, it looks like Ryan Wolfe is going to slowly work his way back into reinstatement into CSI by doing some long, tedious work. Natalia volunteers to help him. None of that is said, but implied. Calleigh shows affection to her ex-husband, so that relationship may be re-kindled. It's just all part of the personal stories they like to show from time to time on this program.

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