The Mentalist (2008)

S1E5 Redwood

After a girl is discovered drenched in blood and clutching the weapon that ended her best friend's life, she's immediately seen as the prime suspect, despite her total amnesia about the incident. However, Jane is convinced of her innocence and devises a daring plan that forces her to confront the harrowing events again, hoping to trigger her memory and uncover the truth.