Tania Raymonde Helen Katz (born March 22, 1988) is an American actress. She played Alex Rousseau in the ABC series Lost from 2006 to 2010, and Cynthia Sanders on the Fox sitcom Malcolm in the Middle between 2000 and 2002. She has appeared on MTV's Death Valley (2011), in the horror film Texas Chainsaw 3D (2013). She notably portrayed infamous convicted killer Jodi Arias in the Lifetime biographical film Jodi Arias: Dirty Little Secret (2013). In April 2015, she joined the cast of the TNT series The Last Ship. From 2016 to 2021, she starred in the Amazon Prime Video series Goliath.
Contents
Early life
Tania Raymonde Helen Katz's father is American and her mother is French, from Corsica. She attended Lycée Français de Los Angeles. Raymonde is bilingual and fluent in French.
She was engaged to artist Zio Ziegler. Since July 2025, she has been in a relationship with actor Nathan Fillion.
Career
Raymonde's first television role was as Alice/Young Syd in the "Syd in Wonderland" episode of the TV series Providence. She subsequently appeared on other TV series, including The Brothers Garcia, The Nightmare Room, That's So Raven, The Guardian, Lost, Medium, Malcolm in the Middle, and NCIS.
She starred in the film Children on Their Birthdays (2002), her first feature film role. In 2003 she played Lauren O'Keefe in the sitcom The O'Keefes.
She is most known for her work on the ABC drama Lost, where she played Alex Rousseau, the adopted daughter of Benjamin Linus, played by Michael Emerson.
She also appeared in the films The Garage (2006), The Other Side of the Tracks (2008), Japan (2008), Chasing 3000 (2008), and Elsewhere (2009). She recurred opposite the late Dennis Hopper on the Starz series Crash. Raymonde also had a recurring role as Frankie Rafferty, Danny Pino's love interest, on season 6 of Cold Case.
She appears in the music video for Maroon 5's "Won't Go Home Without You".
In 2013, Raymonde appeared in two episodes of the NBC series Chicago Fire as a backdoor pilot to set up the spin-off series Chicago P.D. but left the project before the show began. Raymonde also portrayed the infamous convicted murderer Jodi Arias in the Lifetime original movie Jodi Arias: Dirty Little Secret (2013).
From 2016 to 2021 she starred in the Golden Globe-winning Amazon series Goliath, alongside Billy Bob Thornton.