(written from a Production point of view)
Karen Lee Sheperd (born 12 November 1961; age 56) is a stuntwoman and action actress who worked as stunt double on two episodes of Star Trek: Enterprise. She first doubled Linda Park in the episode "The Crossing". Her work as stunt double for Jolene Blalock in the third season episode "Harbinger" was not part of the final episode though she doubled her in some of her moves. 
Sheperd was born in Greeley, Colorado and is a martial arts expert and was the female USA Black Belt champion in 1979-1980. She is also a member of the Blackbelt Hall of Fame and has won several awards such as the Black Belt Woman of the Year Award in 1997. Her face is on hundreds of martial arts magazines and she is best known for her performance as The Enforcer in two episodes of Hercules: The Legendary Journeys (both 1996). Sheperd has doubled "Faith" actress Eliza Dushku in several episodes of Buffy the Vampire Slayer and Angel, actress Nia Peebles in Walker, Texas Ranger, Natalie Raitano in V.I.P., and Madonna in her music video "Die Another Day", where she wore the black suit and fought against stuntwoman Sophia Crawford. She has also doubled for actresses such as Rosa Blasi, Kari Wuhrer, Megan Mullaly, and Jennifer Tung. Sheperd has started her career in several live shows such as "The Adventures of Conan" at the Universal Studios for seven years.
Among her resume are films such as The Shinobi Ninja (1981), America 3000 (1986, with Galyn Görg), Blood Chase (1989), Cyborg 2 (1993, with Tracey Walter and stunts by Simone Boisseree, Lisa Hoyle, Scott Leva, Jeff Pruitt, and Merritt Yohnka), Firestorm (1995, with John Savage and Joseph Culp), Boogie Boy (1998), Mystery Men (1999), The 13th Warrior (1999), Jay and Silent Bob Strike Back (2001), The President's Man: A Line in the Sand (2002), and Midnight Expression (2003) and television series such as Diagnosis Murder (1998, with Susan Gibney), Strong Medicine, Sabrina the Teenage Witch, Boston Legal, Birds of Prey, General Hospital, She Spies, and V.I.P. (1999, with Lisa LoCicero, Derek Mears, Faith Minton, and Darlene Williams).