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The poster states that Neiman, 48, is 'a vulnerable adult' and hasn't been seen since he walked out of Poughkeepsie's MidHudson Regional Hospital on May 21 wearing only green scrubs and socks.
Neiman, who has bipolar disorder, was not carrying any money or a cellphone at the time.
Cohen shared an image of a flyer seeking information about Neiman to his Facebook page. The poster states that Neiman, 48, is 'a vulnerable adult' and hasn't been seen since May 21
The Bravo star, 53, attended school with Neiman in St. Louis, Missouri, and told Page Six: 'I'm praying for his safe return, along with a lot of folks in St Louis'