Petrie confirmed in an email to The Milwaukke Journal-Sentinel that she and the station "have parted ways."
Not long after she joined WTMJ in mid-July, Petrie wrote, her voice quality began to deteriorate. She went to have it checked out, and eventually was diagnosed with spasmodic dysphonia, a neurological disorder affecting the larynx.
The ailment is treatable, and Petrie said in her email that she is regularly seeing a vocal therapist.
"I know I will beat this thing," she wrote.
Petrie has been writing news stories and doing some reporting in the intervening weeks. While her voice has "significantly improved," she wrote, full recovery will take awhile, preventing her from doing the job she was hired for.
Petrie, who came to WTMJ from gigs as a news anchor at radio stations in Houston and Dallas, said it had been "an honor and a pleasure to work with the fine team that makes WTMJ tick."