She shows Delko a suspect mark on the woman's cheek. In the morgue, Alexx Woods postulates to Delko that Aberto's mother, who died of a heart attack, was frightened to the death. Calleigh is able to get an alkali trace off the carpet from the suspect's shoes. When Horatio gets the Livingstons to come out of their panic room he tersely tells Dale, the husband, that he'd better cover Celia's medical bills.
Celia is pregnant and won't allow a rape exam for fear of harming the baby. Horatio, Delko and Tripp respond to a break in call and find Celia Gonzalez, the housekeeper beaten and raped while the family of the house was safe in their panic room. Back at the scene, Eric Delko and Calleigh Duquesne lose the gas trail of the hearse, but they're able to narrow it's range down to a 5 mile radius. She claims to not know he was planning to kill Aberto. A rich young girl, she's dabbling in bad boys and admits under pressure that a guy going by the name of Diablo got her to put up the money for Aberto. Tripp and Horatio pay a visit to Michele Burke who paid for Aberto to come to his mother's funeral. Ryan Wolfe collects DNA and chases away reporter Erica Sikes, who is hoping to get another big scoop from the young CSI. When Frank Tripp tells Horatio that Aberto was in jail for selling drugs in violation of the gang's code, Horatio realizes that this is why Aberto was killed by a member of his own gang. When Horatio spies a pitchfork tattoo on Aberto's chest, he realizes he's dealing with Mala Noche, a deadly gang that deals not in drugs but weaponry and who are renowned for being deadly assassins. Horatio runs to the scene in time to fire a few shots at the man's escape vehicle: a hearse. Aberto Fuentes was transported from jail to attend his mother's funeral, but when he approaches the coffin a man pops out of it, firing a machine gun. They are interrupted by the sound of gunfire. Horatio Caine is at Holy Redeemer church, speaking with Cardinal Benedetti about an old sin that haunts him-a life he took long ago. That the order came all the way from Nicaragua. The lab and Horatio learns that Mala Noche have put a Green Light (a hit) out on them. It's just all part of the personal stories they like to show from time to time on this program.The team must find the connection between the two crime scenes the killing of a drug dealer and the rape of a well-off family's housekeeper who happens to be pregnant with her boss's child. Calleigh shows affection to her ex-husband, so that relationship may be re-kindled. 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.
One of them was post-mortem, with Horatio hoping that was some sort of signature which could help his trace this sicko. 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. It turns out she wasn't so smart, taking another offer for a ride and paying for it dearly. 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. This opening scene was a surprise as we see two women being offered a ride outside a nightclub by some mysterious biker. However, it was just a routine show nothing out of the ordinary. 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.