Warrick is the only member of the team born and raised in Las Vegas. As of season 7, Warrick has never met his father. His mother died when he was seven, leaving Warrick in the care of his maternal grandmother, affectionately referred to as Grams. He grew up in a strict household.
Early in the series, Warrick had a severe gambling problem, one that even started to cross into his professional career. In the pilot episode Warrick left a crime scene, leaving a new CSI,Holly Gribbs, without backup so he could place a bet on a team for a judge. The perpetrator of the crime Holly and Warrick were investigating returned to the scene and shot Holly, who later died as a result of her wounds. Their supervisor, Gil Grissom was supposed to fire Warrick for this, but having already lost one CSI, he did not want to lose another.
Warrick maintains a good friendship with fellow CSI Nick Stokes. Warrick is extremely upset when Nick is kidnapped and buried alive in the two part Season 5 finale, "Grave Danger" parts 1 and 2, as he felt it should have been him to volunteer for the assignment in which Nick was kidnapped (they flipped a coin to see who would take which assignment that evening). Warrick pushed the team as hard as he could when investigating Nick's disappearance, not knowing what he would do if he was unable to save his friend.
After dating a woman named Tina for a short time, he proposed and quickly married her in Season 6. Nearing the Season 6 finale ("Bang-Bang"), Warrick's marriage seemed to have become rocky, but after a scene when Tina's supposed infidelity was shown to be her planning a party for Warrick, in a casino nonetheless, nothing more of the marriage has been shown. Through the mid-point of Season 7, Warrick still wears his wedding band, which would suggest that he and Tina have worked through their differences. In the Season 7 episode Leapin' Lizards he commented that his marriage to Tina might have worked out better if Tina was also a crime scene investigator and better understood the demands of his job. During the second episode of Season 8, Warrick mentions to Catherine that he had divorced his wife.
