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I'd suggest reading Memory Alpha's article on Lien for the full explanation, but in short; the original plan was to cut Garret Wang from the show to bring on Seven of Nine (which is why Kim was infected in Scorpion, to lay the groundwork to kill the character off) but Wang was named in People Magazine's 50 most beautiful people, which would have made it difficult to eliminate his character. Since they had already signed Jeri Ryan's contract, they had to keep Seven and get rid of someone else- so it was Lien, and they decided to not renew her contract.

The article also contains some reaction from various people. 31dot (talk) 21:23, August 9, 2012 (UTC)

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