When a show runs for 20 years as "Criminal Minds" has, it's exceedingly rare for it to retain its cast all the way through. And it hasn't! The serial killer hunting Behavioral Analysis Unit (BAU) at the FBI has a revolving door, with new profilers coming and leaving quite often. Mandy Patinkin, who originally starred as the show's central character, Jason Gideon, abruptly left early in "Criminal Minds" season 3 – and he wasn't the last.

The shortest-lived "Criminal Minds" stars was Rachel Nichols, who played FBI trainee Ashley Seaver. She debuted about halfway through season 6, stayed until the end of that season, and then left. There was some Clarice Starling in Ashley's character, but her backstory was even more horrifying than seeing some lambs get slaughtered. Ashley's father was

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