Casey Anthony Porn Offer Killed

Hirsch -- who reached out to Anthony's lawyer yesterday in the hopes of landing a deal -- has now reversed course ... telling TMZ, "It has become obvious to us that Vivid fans, and people in general, want nothing to do with her and that includes a XXX movie."

Hirsch explains, "We were ready to make an offer to Casey to star in one of our feature films. It's clear to me now, however, that there has been an overwhelmingly negative response to our offer and so we've decided to withdraw it."