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Shellie Zimmerman -- who stood solidly by husband George Zimmerman during his trial for gunning down Trayvon Martin -- now says she has doubts about George's innocence.

Shellie -- who's in the middle of a nasty divorce -- appeared on the "Today" show, saying "I think anyone would doubt [George's] innocence, because I don't know the person that I've been married to."

As for why Shellie's changing her tune ... she says it's all about the incident at their home this month when she called cops and claimed George was threatening her with a gun.