US TV
Rex Features
The actors, who play Violet and Auggie respectively, will make their final appearances on screen in January after the murder mystery storyline reaches a climax in December.
"We always knew that this murder mystery would end in episode 12," executive producer Todd Slavkin told Entertainment Weekly. "And we always knew that [Ashlee's] character of Violet would be instrumental in that as a suspect, and [Colin's character] Auggie as well.
"And once that murder mystery was solved, she would go on her way. That was the original plan going into the development of the show."
It was recently announced that Heather Locklear, who played Amanda Woodward on the 1990s series, will reprise her role on Tuesday, November 17.
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