"I have doubts but I also believe the evidence," Shellie Zimmerman said on NBC's "Today" show.
"I believe the evidence, but this revelation in my life has really helped me take the blinders off and start to see things differently."
The "revelation" came after the Zimmermans were involved in a domestic dispute during which she told police he was threatening her with a gun at their home in Lake Mary.
Neither of them was arrested, but Shellie said she now wishes she had pressed charges.
Asked on "Today" if she now doubted her husband acted in self-defense in shooting the unarmed, 17-year-old black teenager, Zimmerman said, "I think anyone would doubt that innocence because I don't know the person that I've been married to. I have doubts, but I also believe the evidence."
However, she denied George Zimmerman profiled the youth.
Shellie Zimmerman filed for divorce Sept. 5. George Zimmerman admitted shooting Martin in Sanford in 2012, saying he acted in self-defense, and was found not guilty in his death July 13.