Friends and family announced the reward in a news release Tuesday.
The Chicago woman was in the midst of a month-long retreat with Yoga Retreat Bahamas on Paradise Island to become a yoga instructor when she stopped showing up to classes on June 20. She was last seen on June 19.
Her family said last week they believed there is some prejudice involved since 42-year-old Casey is transgender.
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The chief superintendent of police was suspended from the force earlier this month, in an unrelated matter.
The family has also retained attorney John Q. Kelly, and is not aware of any new leads, the release said.