The actor, who released HowardCantour.com Monday, was accused and quickly copped to "being inspired by" and failing to properly credit Daniel Clowes for borrowing from his 2007 graphic novella.
Clowes' publisher, Fantographics' Eric Reynolds, slammed LaBeouf for ripping off Clowes' novel, Justin M Damiano, "word for word."
"LaBeouf changed the name of the main character, but he used the comic as a direct script and storyboard," Reynolds said. "LaBeouf just used the dialogue word for word. There is no ambiguity."
"It just defies any kind of logic or good sense," Reynolds added, saying he was considering his legal options. "This was so blatant and inexcusable that it was as baffling as it was appalling."
Celebrity Families of 2014 [PHOTOS]