Palmer's Minnesota office has been closed due to protesters who have swarmed the business. Earlier this week, he released a letter to his patients as an apology.
"I had no idea that the lion I took was a known, local favorite, was collared and part of a study until the end of the hunt," Palmer wrote. "I relied on the expertise of my local professional guides to ensure a legal hunt. I have not been contacted by authorities in Zimbabwe or in the U.S. about this situation, but will assist them in any inquiries they may have."