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what happened to peyton in one tree hill season 7
On May 12, 2009, it was confirmed that Hilarie Burton, who portrayed Peyton Sawyer  would not be returning for the seventh season.
Why did Hilarie Burton leave One Tree Hill?
Hilarie Burton explained she hoped for more creative control before leaving the show.
did any other character besides peyton sawyer not return for one tree hill season 7
In May 2009, The CW announced Chad Michael Murray, who portrayed Lucas Scott, would not be returning to One Tree Hill for its seventh season.

Question: what was the rationale
Self-contained rewrite: What was the rationale for Chad Michael Murray leaving One Tree Hill?