Jodi Lyn O'Keefe (born October 10, 1978) is an American actress, model, and fashion designer. She came to prominence as Cassidy Bridges on the television series Nash Bridges (1996–2001) and played Gretchen Morgan on Prison Break (2007–2009), Jo Laughlin on The Vampire Diaries (2014–2017), and Lionel Davenport on Hit the Floor (2014–2018). Her film credits include Halloween H20 (1998) and She's All That (1999).

Early life
O'Keefe was born in the Cliffwood Beach section of Aberdeen Township, New Jersey, the daughter of Noreen, a homemaker, and Jack O'Keefe, a director of labor relations for Merck.

She graduated from St. John Vianney High School.