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Actors can't stay on a show forever, especially one as long-running as "CSI" -- here are some of the actors who left, and the stories behind their departure.

Any long-running show like "Chicago Fire" has a revolving door of characters, with actors departing to best suit both the narrative and their own careers.

Every "Doctor Who" actor has to leave the timeless series eventually. However, some stars depart the show for very specific reasons.

Here's why Nev Schulman's "Catfish" co-host, Max Joseph, surprisingly left the show in 2018 after nearly seven seasons.

Dick York starred on the first few seasons of "Bewitched," but ended up being replaced in his role as Darrin. Here's why the actor left the show.

Hugh Dillon played a prominent role on "Yellowstone" for multiple seasons. And when he left, well, it was for a very specific behind-the-scenes reason.

Danny Huston played a critical role on "Yellowstone" as land developer Dan Jenkins. Here's a look at the real reason he was written off the show in Season 2.

Lauren Holly's NCIS character Jennifer Shepard spent her whole career working her way up to becoming Director of the Naval Criminal Investigative Service, only to be gunned down some three years into the top job. Here's the real reason Lauren Holly left NCIS.

"The O.C." has left an indelible mark on viewers of the early aughts. However, many fans are still left wondering the real reason Mischa Barton left the show.

Shelley Long was once one of the shining lights of Cheers, but she gave it all up after only five seasons.

While "Charmed" was one of the shows to be recently canceled by the CW, what made actress Madeleine Mantock leave the show after only three seasons?

After a decade as part of the cast, fan-favorite Kate McKinnon chose to leave "Saturday Night Live" following Season 47, and here's the reason why.

After a run of nearly 90 episodes, Jimmy Smits decided to leave acclaimed TV drama "NYPD Blue." Here's why he stepped away from Detective Bobby Simone.

Roshawn Franklin's "FBI" character was killed off in the Season 6 premiere, a creative decision the showrunner promises will continue to affect the series.

Here's why Mark Consuelos, who played the villainous Hiram Lodge on The CW's "Riverdale," left the show after its fourth season.

While fans may never have expected Yuriy Sardarov to leave "Chicago Fire," his Season 8 exit helped demonstrate consequences still existed in the series.

Pedro Pascal's character was conspicuously absent from "Narcos: Mexico," but it turns out there was a perfectly valid reason why his story ended with "Narcos."

Elias Koteas played Alvin Olinsky in more than 100 episodes of "Chicago P.D." Here's why the character was ultimately written off the show.

Liz Vassey played Wendy Simms for 5 seasons of CSI before abruptly leaving the show. What's the real story behind her departure from the series?

Benny Severide's shocking death on "Chicago Fire" was carefully planned out by the show's writers, giving the late Treat Williams a dramatic exit.

Given how fondly Alexandra Paul looks back on her time on "Baywatch," it may surprise fans to hear why she left.

Lisa O'Hare's Georgia was a fan-favorite character on NBC's medical drama "New Amsterdam," so why did the actor leave the show so early in its run?

Here's why Melina Kanakeredes, who played Stella on CSI: NY, left the show after six seasons.

Here's what we know about Rick Cosnett's departure from "The Flash" at the end of Season 1.

Plenty of series see characters come and go during their runs, and reality TV is no exception. So why did Cato leave "Iron Resurrection" before Season 4?

Behind the scenes of the classic CBS show "The Waltons," some of the actors weren't always content. Here's why Michael Learned eventually left the series.

Chris Klein made an impression when he joined the cast of The CW's "The Flash" as Orlin Dwyer aka Cicada. But why did he leave the show after just one season?

Colton Haynes made his mark on the CW when he played Arsenal on "Arrow." Fans were stunned by his sudden departure, and now he's opening up about why he left.

After playing the fan-favorite character Radar in M*A*S*H for years, Gary Burghoff left the show in Season 8. Here's likely why he made this decision.

The classic television series M*A*S*H featured a surprising amount of cast turnover over the seasons. Here's why McLean Stevenson decided to leave the show.