Katrina Law

Katrina Law (born Joyce Houseknecht) is an American actress. She is known for playing the roles of Mira on the Starz television series Spartacus: Blood and Sand and Spartacus: Vengeance, Nyssa al Ghul on The CW television series Arrow, Karen Beach on the Sony Crackle series The Oath, Quinn Liu on the CBS series Hawaii Five-0, and Jessica Knight on the CBS series NCIS.

Early life and education Law was born in Philadelphia and grew up in Deptford Township, New Jersey. Her mother is Taiwanese and her father is of German and Italian descent. She graduated from the Richard Stockton College of New Jersey with a B.A. in Performing Arts (Theatre Performance) in 1999.

Career Law worked alongside director Adrian Picardi with producers Eric Ro and Don Le, to create a low budget web series called The Resistance. Picardi was the series' official creator and director. The show was later picked up by Starz which led to Law's casting in Spartacus: Blood and Sand in 2009. In 2011, Law completed an action-oriented project called 3 Minutes with director Ross Ching, producers Don Le and George Wang, starring Harry Shum Jr., Stephen "tWitch" Boss (the runner up on season 4 of Fox's So You Think You Can Dance), and herself.

From 2014 to 2020, she had a recurring role on The CW television series Arrow as Nyssa al Ghul, the daughter of the notorious leader of the League of Assassins, Ra's al Ghul.

In 2019, Law was cast as co-lead in the CBS pilot Alive, as medical examiner Elizabeth Lavenza, whose husband Mark Escher (Ryan Phillipe) is brought back to life by the mysterious Dr Frankenstein (Aaron Staton). Later that year she joined the cast of CBS's Hawaii Five-0 for the series' tenth season. In March 2021, Law was cast in the eighteenth season of NCIS in the role of Jessica Knight. She appeared in the final two episodes of the season with the potential to become a series regular if the series is renewed for a nineteenth season; it was later confirmed that Law would become a series regular beginning with the nineteenth season. In January 2022, it was announced that Law's NCIS character would crossover to NCIS: Hawaiʻi for an episode.

Personal life Law married actor Keith Andreen in January 2013. In December 2018, she gave birth to their daughter. Law filed for divorce on August 11, 2025.

Law has an older brother, Kenneth Houseknecht, who in April 1988, at age 14, murdered a neighbor girl who was 12 years old. In July 2026 Law testified via Zoom on her brother's behalf in his attempt to be released from prison.

Filmography

Film Year Title Role Notes 2000 Lucky Numbers Teen Girl also known as Lucky Number (Japan: English title) 2001 Bottomfeeders Ursula 2002 Emmett's Mark Francine also known as Killing Emmett Young (video title) 2005 Choker Santo also known as Disturbance (DVD box title) 2006 All In Dealer No. 1 2007 A New Tomorrow Katherine Schatz 2008 Stiletto Biker Chick No. 2 Direct-to-video film; also known as Velvet Spider (Japan: English title) 2009 Alpha Males Experiment Jenna originally titled Knuckle Draggers 2010 The Grind Jemma 2011 3 Minutes Female Hunter Short film 2015 Death Valley Annie Gunn 2015 Checkmate Katana 2017 Darkness Rising Izzy 2024 Werewolves Dr. Amy Chen Mafiosa Alex Johnson produced in 2010, but not released

Television