[TADSLOS]

Burt Reynolds, turning down the Star Wars part of Han Solo offered by George Lucas comes to mind.

[Blackirish]

Also again Burt Reynolds. Turned down lead in “One Flew Over the Cookies Nest” directed by Stanly Kubrick to star in Smokey and the Bandit.

Jack Nickolson instead took the part and won best actor.

[Fast Moving Angel]

Burt Reynolds, turning down the Star Wars part of Han Solo offered by George Lucas

I hadn't heard that, but I bet he would have been good in the part. I sure liked him in the first "Smokey & the Bandit" role.

And for that matter. M*A*S*H sure went downhill after Wayne Rogers left.