Monster

Charlize Theron

Aileen Wuornos

Christina Ricci

Selby Wall

Bruce Dern

Thomas

Lee Tergesen

Vincent Corey

Annie Corley

Donna

Pruitt Taylor Vince

Gene / Stuttering "John"

Marco St. John

Evan / Undercover "John"

Marc Macaulay

Will / Daddy "John"

Scott Wilson

Horton / Last "John"

Rus Blackwell

Cop

Tim Ware

Chuck

Stephan Jones

Lawyer

Brett Rice

Charles

Kaitlin Riley

Teenage Aileen

Cree Ivey

7-Year-Old Aileen

Catherine Mangan

Justy

Magdalena Manville

Bar Lap Girl

T. Robert Pigott

Bartender

Romonda Shaver

Employment Agent

Glenn R. Wilder

Restaurant Manager

Elaine Stebbins

Wife at Accident

Kane Hodder

Undercover Cop

Christian Stokes

Undercover Cop

Lyllian Barcaski

Bar Girl

Nonalee Davis

Bar Girl

Bubba Baker

Cubby

Al

Himself

Cannonball

Himself

Chad Vaccarino

Trevor

Gene R. Stephenson

Judge

Jesse Stern

Skate Rink Attendant

Billy Boylan

Police Chief

Jim R. Coleman

Newscaster

Chandra Leigh

Cute Teenage Attendant

Lori McDonald

Attendant

Adam Brown

Attendant

Ed Donovan

State Prison Guard (non-crédité)