She is a 28 year old supermodel from San Fierro with a history of drug and alcohol abuse. She is a parody of both supermodel Kate Moss and singer Britney Spears (particularly her 2007 meltdown). She also resembles Britney Spears in her GTA V appearance.
Not much is known about Kerry's story before the events of GTATBoGT. According to her LCPD Database page, she has been arrested twice, once in 2006 for a DWI (Driving While Intoxicated) and also in 2007 for possession of cocaine. Also in 2007, she was photographed with a male stripper blowing cocaine up her ass at a Love Fist reunion after-party, which marked the beginning of her breakdown and subsequently boosted her career according to Weazelnews.com. She had a reality show sponsored by Salivex, who pulled down its ads in 2008 due to the lack of breakdowns on camera. After her agent told her the news, she ran naked through the freeway while pulling out her hair.
Events of TBoGT
In The Ballad of Gay Tony, during one Club Management session, Luis has to drive to Bohan to the Iron Belly Deli to pick up a take-out order and return the food to the Hercules gay bar for Ms. McIntosh. During this errand, Ms. McIntosh's personal assistant Danni calls Luis multiple times en route to the club, checking on the order. If the player takes too long to deliver, Ms. McIntosh finds a pizzeria in Alderney, much to the frustration of Luis, who went through all that trouble for nothing.
Presumably the night before the mission Tunnel of Death, she went to a four-day, luxury rehab clinic in Los Santos before checking out on day three, again going under the influence of drugs and alcohol and crashing her red Huntley Sport into a Wigwam Burger restaurant that night. She was supposedly going to stay at another luxury rehab facility in outer space when she decided to stay on earth and sue her previous clinic for being ineffective, later going to a Bahamas luxury clinic. Not long after, she chased a bathroom-peeping paparazzi away from her townhouse wielding a kitchen knife.
Her in-game face model in GTA V is the same one used for Lacey Jonas and Sub Urban cashiers, though cosmetics are used for Kerry's one. Her model in GTA IV is the same model used for pictures of Jill Von Crastenburg (albeit without bleached hair and different clothing palettes) and rich female pedestrians found around inner-city Algonquin and Rotterdam Hill.
Her clothing model in GTA V is very similar to the clothing she wore in GTA IV, albeit with a different skirt pattern.